Answer:
Summary: Nutrition and exercise are critical for improving body composition. Keeping your calories, fiber and protein in check is a good first step. All exercise can help with fat loss, but weight training is the best way to increase muscle mass.
Explanation:
Answer: TRUE
Explanation:
Give an example of newtons 1st, 2nd and 3rd law of motion?
A projectile fired into the air explodes and splits into two halves of equal mass that hit the ground at the same time. If the projectile had not exploded, it would have landed at point X, which is a distance R to the right of the launch point. After the explosion, one of the halves lands at poit Y, which is a distance 2R to the right of the launch point. If air resistance is negligible, where did the other half land?
(A) To the left of the launch point
(B) At the launch point (q)
(C) Between the launch point and point X
(D) Between points X and Y
Answer:
B: At the launch point
Explanation:
We are told that after the explosion, one of the halves landed at the point Y, which is a distance 2R to the right of the launch point. Now, if air resistance is negligible, it means the other half will land at the launch point. This is clear from the model projectile motion curve of this explosion I've done in wolfram and attached.
jennifer is trying out for the soccer team and really wants to make varsity. after tryouts she learns she is on the junior varsity team
How would each react?
Jennifer is trying out for the soccer team and really wants to make varsity. After tryouts, she learns she is on the junior varsity team.
Carlos is struggling with math. It is his most challenging subject and he is worried about a big test tomorrow. He has time to study, but isn't sure it is worth it.
The two most common isotopes of tin have atomic masses of 118 and 120.
How do atoms of these two isotopes differ?
A. One of them has two fewer electrons than the other.
B. The heavier isotope has two more protons than the lighter isotope.
C. The lighter isotope has two more neutrons than the heavier
isotope.
D. The heavier isotope has two more neutrons than the lighter
isotope.
Answer:
It's D!
Explanation:
The two most common isotopes of tin have atomic masses of 118 and 120 and have the key difference that the heavier isotope has 2 more neutrons than the lighter one.
What is Tin?Tin is the element that has the largest number of stable isotopes, only out of the ten are potentially radioactive but have not been observed to decay.
What is the difference between Tin118 and Tin120?
We know that Tin 118 and Tin 120 are the isotopes of the tin, but the key difference between them is that the Tin 120 has two more neutrons than Tin118, therefore, the isotopic mass of the two is different as well.
Mass of Tin118 < Mass of Tin120
Therefore, from all the provided options the correct option is that the heavier isotope has two more neutrons than the lighter isotope.
Hence, the correct option is d.
Learn more about Isotopes:
https://brainly.com/question/13214440
A small block of mass m slides on a horizontal surface where friction between the block and the surface is negligible as it travels around the inside wall of a hoop of radius R. The coefficient of friction between the block and the wall is μk. The block is given an initial speed vo tangent to the hoop and allowed to travel along the inside edge. The velocity of the block at time is:_____
Answer:
v = v_o/(1 + (tv_o(μ_k)/R))
Explanation:
We are told that the coefficient of friction between the block and the wall is μ_k.
Now, formula for the frictional force will be;
F_fric = -μ_k × mv²/R
mv²/r is used because it is a centripetal motion.
Now, we know that F = ma = m(dv/dt)
Thus;
m(dv/dt) = -μ_k × mv²/R
m will cancel out to give;
dv/dt = -μ_k × v²/R
Rearranging to get;
dv/v² = -μ_k × (1/r)dt
We are told the initial velocity is v_o.
Thus, let the final velocity be v.
The initial time is 0 and thus the final time will be represented by t.
Thus;
(v,v_o)∫dv/v² = (t, 0)∫-μ_k × (1/R)dt
Integrating this we have;
-1/v - (-1/v_o) = -((μ_k)/R) × (t - 0)
-(1/v) + (1/v_o) = -t(μ_k)/R
Rearranging to get;
1/v = (1/v_o) + t(μ_k)/R
Simplifying the right hand side gives;
[R + tv_o(μ_k)]/Rv_o
Thus;
1/v = [R + tv_o(μ_k)]/Rv_o
v = Rv_o/[R + tv_o(μ_k)]
Simplifying further gives;
v = v_o/(1 + (tv_o(μ_k)/R))
Express the mathematical formula to calculate the number of images formed when two mirrors are inclined at θ angle.
Answer:
The number of images formed by two adjacent plane mirrors depends on the angle between the mirror. If (in degrees) is angle between the plane mirrors then number of images are given by, n = 360 θ − 1.
A force of 40N is applied to a 28 g mass, what is the acceleration? (round to the hundredths place)
___________________________________m/s2
Answer:
1428.6m/s²
Explanation:
Given parameters:
Force applied on the body = 40N
Mass of the body = 28g
1000g = 1kg
28g will therefore be 0.028kg
Unknown:
Acceleration = ?
Solution:
To solve this problem, we use the expression derived from Newton's second law of motion.
Force = mass x acceleration
Insert the parameters and solve;
40 = 0.028 x acceleration
Acceleration = [tex]\frac{40}{0.028}[/tex] = 1428.6m/s²
What is the least number of forces required to stretch a spring?
Answer:
The least number of forces required to stretch a spring is one.
Explanation:
Let suppose that spring is ideal, that is, that effects from its mass can be neglected since it is insignificant in comparison with external forces. In addition, let the spring have a linear behavior, meaning that net external longitudinal force exerted on spring is directly proportional to defomation. (Hooke's Law) That is:
[tex]F \propto x[/tex] (1)
[tex]F = k\cdot x[/tex] (2)
Where:
[tex]F[/tex] - Net external force, measured in newtons.
[tex]k[/tex] - Spring constant, measured in newtons per meter.
[tex]x[/tex] - Deformation of spring, measured in meters.
Hence, the least number of forces required to stretch a spring is one.
Please help!! 20 points!!
Answer:
4
Explanation:
What is Nature? How does it explain the human condition?
Answer:
Explained below.
Explanation:
Nature is defined as all of the genes as well as hereditary factors that influence both the physical appearance and personality manifestations of any individual.
For example, a child could inherit certain physical traits and characters from his/her parents which in turn shapes the physique and personality of such an individual in the world.
A 1500 kg truck is acted upon by a force that decreases its speed from 25 m/s to 15 m/s in 8 s. What is the magnitude of the force acting on the truck?
Answer:
F = 1,875 N
Explanation:
force=
[tex] \frac{change \: in \: momentum}{time \: taken} [/tex]
∆H = m∆V
where ∆H ----> change in momentum.
( final momentum - initial momentum )
and ∆V ----> change in velocity
( final velocity - initial velocity )
and m ----> is mass
then f =
[tex] \frac{1500 \times (25 - 15)}{8} [/tex]
= 1,875 N
What are two reasons digital storage of data is more secure than analog storage?
A.
A computer program can be used to encode digital data.
B.
A fingerprint can be used to control access to digital data.
C.
A computer program can easily change digital data.
D.
A stronger password is needed to access digital data.
Digital storage of data is more secure than analog storage because a stronger password is needed to access digital data and fingerprint can be used to control access to digital data.
What is analog device storage?Content that employs a technique in which data is represented by continuously varying physical quantities is known as analog device storage
In paper,cave,microfilm is the best example of analog data storage.
Digital storage of data is more secure than analog storage;
B. A fingerprint can be used to control access to digital data.
D. A stronger password is needed to access digital data.
To learn more about analog device storage, refer to the link;
brainly.com/question/11599772
#SPJ2
Answer: A, B
Explanation: did the test
An archer pulls her bowstring back 0.410 m by exerting a force that increases uniformly from zero to 270 N. How much work is done in pulling the bow?
Answer:
110.7Joules
Explanation:
Work is said to be done when the force applied to a body cause the body to move through a distance. Mathematically:
Work done = Force * Distance
Given the following
Force = 270 -0 = 270N
Distance moved = 0.410m
Required
The work done
Substitute the given parameters into the formula
Workdone = 270 * 0.41
Workdone = 110.7Joules
Hence the work done in pulling the bow is 110.7Joules
A salmon jumps up a waterfall 2.4 m high. With what minimum speed did the salmon leave the water below to reach the top?
PLEASE HELP I NEED ANSWER BEFORE MIDNIGHT
I WILL MAKE BRAINLIEST
The audio power of the human voice is concentrated at about 300 Hz. Antennas of the appropriate size for this frequency are impracticably large, so that to send voice by radio the voice signal must be used to modulate a higher (carrier) frequency for which the natural antenna size is smaller. a. What is the length of an antenna one-half wavelength long for sending radio at 300 Hz
Answer:
the length of an antenna one-half wavelength long for sending radio at 300 Hz is 500 km
Explanation:
Given the data in the question;
we know that wave length is;
λ = c/f
c is the speed of voice ( 3 × 10⁸ m/s )
frequency f = 300 Hz
so we substitute
λ = 3 × 10⁸ / 300
λ = 1000000 m
we know that; 1 km = 1000 m
so
λ = 1000000 m / 1000
λ = 1000 km
hence, an antenna one-half wavelength will be;
λ /2
= 1000 km / 2
= 500 km
Therefore, the length of an antenna one-half wavelength long for sending radio at 300 Hz is 500 km
9) A rock is projected upwards from the surface of the moon at time t = 0.0 s with a velocity of 30 m/s (the acceleration due to gravity at the surface of the moon is -1.62 m/s2. The rock rises, then falls and strikes the ground. Consider all quantities as positive in the upward direction. What is the velocity during accent at 180 m above the surface? At time t = 10 s, what is the height of the rock from the ground?
Answer:
a) The velocity of the rock during ascent at 180 meters above the surface is approximately 17.799 meters per second.
b) The height of the rock from the ground is 219 meters from the ground.
Explanation:
a) The rock experiments a free fall, in which this element is projected upwards, decelerated until rest is reached and then it falls down. Please notice that free fall is a case of uniformly accelerated motion, in which object is accelerated by gravity. The velocity of the rock is described by the following kinematic equation:
[tex]v = \sqrt{v_{o}^{2}+2\cdot a\cdot \Delta s}[/tex] (1)
Where:
[tex]v_{o}[/tex] - Initial velocity, measured in meters per second.
[tex]v[/tex] - Final velocity, measured in meters per second.
[tex]a[/tex] - Gravitational acceleration, measured in meters per square second.
[tex]\Delta s[/tex] - Travelled distance, measured in meters.
If we know that [tex]v_{o} = 30\,\frac{m}{s}[/tex], [tex]a = -1.62\,\frac{m}{s^{2}}[/tex] and [tex]\Delta s = 180\,m[/tex], then the velocity during ascent at 180 meters is:
[tex]v =\sqrt{\left(30\,\frac{m}{s} \right)^{2}+2\cdot \left(-1.62\,\frac{m}{s^{2}}\right)\cdot (180\,m) }[/tex]
[tex]v \approx 17.799\,\frac{m}{s}[/tex]
The velocity of the rock during ascent at 180 meters above the surface is approximately 17.799 meters per second.
b) The height of the rock is calculated from this kinematic formula:
[tex]s = s_{o}+v_{o}\cdot t +\frac{1}{2}\cdot a \cdot t^{2}[/tex] (2)
Where:
[tex]s_{o}[/tex] - Initial position of the rock, measured in meters.
[tex]s[/tex] - Final position of the rock, measured in meters.
[tex]v_{o}[/tex] - Initial velocity of the rock, measured in meters per second.
[tex]t[/tex] - Time, measured in seconds.
[tex]a[/tex] - Acceleration, measured in meters per square second.
If we know that [tex]s_{o} = 0\,m[/tex], [tex]v_{o} = 30\,\frac{m}{s}[/tex], [tex]t = 10\,s[/tex] and [tex]a = -1.62\,\frac{m}{s^{2}}[/tex], then the height of the rock from the ground is:
[tex]s = 0\,m + \left(30\,\frac{m}{s} \right)\cdot (10\,s)+\frac{1}{2}\cdot \left(-1.62\,\frac{m}{s^{2}} \right)\cdot (10\,s)^{2}[/tex]
[tex]s = 219\,m[/tex]
The height of the rock from the ground is 219 meters from the ground.
The Porsche 911 turbo S is one of the fastest production cars in the world. It can go from 0-60 mph (0-27.7 m/s) in 2.9 seconds. What is the acceleration of this car in m/s^2?
Answer:
Acceleration = 9.55m/s²
Explanation:
Given the following data;
Initial velocity = 0m/s
Final velocity = 27.7m/s
Time = 2.9 secs
To find the acceleration;
In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.
This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.
Mathematically, acceleration is given by the equation;
[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]
Substituting into the equation, we have;
[tex]a = \frac{27.7 - 0}{2.9}[/tex]
[tex]a = \frac{27.7}{2.9}[/tex]
Acceleration = 9.55m/s²
2. Which type of time-measuring device makes use of the principle of isochronism?
Answer:
pendulums
Explanation:
A mass is hung from a vertical spring and allowed to come to rest or its equilibrium position. The mass is then pulled down an additional 0.25 meters and released. As the mass oscillates it completes one full cycle in 3.0 seconds. Place the numbers below to correctly identify the mass's amplitude, full range of vertical motion, frequency, and period. The full range of vertical motion is the distance between the maximum and minimum heights of the mass.
e amplitude of the spring is______ m.
The full range of vertical motion is _____m.
The frequency of the spring is______ Hz.
The period of the spring is_______ s.
Answer:
Explanation:
Time period of oscillation T = 3 s .
Frequency of oscillation = 1 / T = 1 / 3 = .333 per second .
The mass is pulled down an additional 0.25 meters so amplitude of oscillation A = .25 m .
Full range of vertical motion = .25 x 2 = 0.5 m .
The period of the spring = 3 s .
What causes acid rain?
Answer:
Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.
Answer:
Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air.
Explanation:
Acid rain results when sulfur dioxide (SO2) and nitrogen oxides (NOX) are emitted into the atmosphere and transported by wind and air currents.
An ant is following a circular pheromone trail. The ant takes 14 s to complete one ‘lap’ and is moving at a speed of 8.5 cm s−1.
What is the radius of the pheromone trail?
What is the angular velocity of the ant?
Explanation:
hold I will tell u the answer 1 sec
A boy is looking into a plane mirror. His nose is 30 cm in front of the mirror.
How far is his nose from where its image appears to be?
HELP I NEED TO SUBMIT MY SCIENCE HW IN LIKE 30 MINS!!!
Answer:
Hug g g fed gvgcgcgcg
Explanation:
G gcgvhcvkgj
If you sprain an ankle your most likely to injure a *
A) patella
B) ligament
C) ACL
D) cardiac muscle
compare the maximum rate of heat transfer to the basal metabolic rate by converting a BMR of 88 Kcal/hr into watts. What is the value
Answer:
The Basal Metabolic Rate of 88 kilocalories per hour is equal to 102.276 watts.
Explanation:
A watt is equal to 1 joule per second, a kilocalory equals 4184 joules and a hour equals 3600 seconds. We convert the Basal Metabolic Rate (BMR) from kilocalories per hour into watts by following conversion:
[tex]x = 88\,\frac{kcal}{hr}\times \frac{4184\,J}{1\,kcal}\times \frac{1\,h}{3600\,s}[/tex]
[tex]x = 102.276\,W[/tex]
The Basal Metabolic Rate of 88 kilocalories per hour is equal to 102.276 watts.
A scientist uses electricity to break down water into hydrogen gas and oxygen
gas. Which statement best explains what happens?
A. A chemical change occurs.
B. A base neutralizes an acid.
C. An acid neutralizes a base.
D. A physical change occurs.
Answer: A chemical change occurs.
Explanation:
A. A chemical change occurs.
B. A base neutralizes an acid.
C. An acid neutralizes a base.
D. A physical change occurs.
what is the relationship between the dipole moment and bond moment? explain it with examples ,how it possible for a molecule to have bond moment and yet be nonpolar?
Answer:
Explained below
Explanation:
The relationship between dipole moment and bind moment is that Dipole moment of a molecule is defined as the resultant of all the bond moments and moments that are due to any existing lone pair.
For example, If a covalent bond is formed between two different elements that have different electronegativity, it means that the bond will become polar. Now, thee shared electron pair existing in the covalent bond gets more attracted to the more electronegative atom. As a result of that, the negative pole will now develop on that atom and thereby making positive pole to develop on the other atom.
If a molecule has a symmetrical shape and as a result all of its bond moments are equal, it means that the molecule will be non-polar. Examples that exhibit this are: CO2, CH4, BF3, etc.
What is unusual about the material that Emily invented?
Answer:
The material that Emily invented can be easily repaired by shining ultraviolet light on it.
Explanation:
Hope it helps! Please mark brainliest.
Answer:
The material that Emily invented can be easily repaired by shining ultraviolet light on it.
Explanation:
If the grasses have 100 units of energy, how much can be passed to the grasshoppers?
The acceleration of a particle is constant. At t = 0, the particle is at the origin and the velocity of the particle is vo = vji+ v2j. At time t = T, the velocity of the particle is v = v3j. Here v1, v2, and v3 are constants with dimensions of length divided by time. All answers should be written in terms of vj, v2, V3, T, and the unit vectors i and j.
Part (a) What is the particle's acceleration vector?
Part (b) What is the particle's position vector at t= 2T?
Part (c) What is the particle's velocity vector at t =2T?
Answer:
a) a = [tex]- \frac{v_1}{T}[/tex] i ^ +[tex]\frac{v_3 - v_2}{T}[/tex] j^, b) r = 2 v₃ T j ^, c) v = -v₁ i ^ + (2 v₃ - v₂) j ^
Explanation:
This is a two-dimensional kinematics problem
a) Let's find the acceleration of the body, for this let's use a Cartesian coordinate system
X axis
initial velocity v₀ₓ = v₁ for t = 0, velocity reaches vₓ = 0 for t = T, let's use
vₓ = v₀ₓ + aₓ t
we substitute
for t = T
0 = v₁ + aₓ T
aₓ = - v₁ / T
y axis
the initial velocity is [tex]v_{oy}[/tex] = v₂ at t = 0 s, for time t = T s the velocity is v_{y} = v₃
v₃ = v₂ + a_{y} T
a_{y} = [tex]\frac{v_3 - v_2}{T}[/tex]
therefore the acceleration vector is
a = [tex]- \frac{v_1}{T}[/tex] i ^ +[tex]\frac{v_3 - v_2}{T}[/tex] j^
b) the position vector at t = 2T, we work on each axis
X axis
x = v₀ₓ t + ½ aₓ t²
we substitute
x = v₁ 2T + ½ (-v₁ / T) (2T)²
x = 2v₁ T - 2 v₁ T
x = 0
Y axis
y = [tex]v_{oy}[/tex] t + ½ a_{y} t²
y = v₂ 2T + ½ [tex]\frac{v_3 - v_2}{T}[/tex] 4T²
y = 2 v₂ T + 2 (v₃ -v₂) T
y = 2 v₃ T
the position vector is
r = 2 v₃ T j ^
c) the velocity vector for t = 2T
X axis
vₓ = v₀ₓ + aₓ t
we substitute
vₓ = v₁ - [tex]\frac{v_1}{T}[/tex] 2T = v₁ - 2 v₁
vₓ = -v₁
Y axis
[tex]v_{y}[/tex] = v_{oy} + a_{y} t
v_{y} = v₂ + [tex]\frac{ v_3 - v_2}{T}[/tex] 2T
v_{y} = v₂ + 2 v₃ - 2v₂
v_{y} = 2 v₃ - v₂
the velocity vector is
v = -v₁ i ^ + (2 v₃ - v₂) j ^
A rocket lifts a payload upward from the surface of Earth. The radius of Earth is R, and the weight of the payload on the surface of Earth is W. The force of Earth's gravity on the payload is W/2 when the rocket's distance from the center of the Earth is
A. R
B. sqrt(2)R
C. 2R
D. 2sqrt(2)R
E. 4R
Answer:
the correct answer is B r =√2 R
Explanation:
To solve this exercise we will use the force of gravity, at two points when the rocket is on the platform and when it is at the desired height.
Rocket with cargo on the platform
[tex]F_{g} = G \frac{ m M }{R^2} = W[/tex]
where m is the mass of the rocket and the charge, M the mass of the earth and R the distance from the center of the earth
Rocket loaded at desired height
[tex]F_{g} = G \frac{m M}{r^2 } = \frac{W}{2}[/tex]
we write our two equations
W = g m M / R²
[tex]\frac{W}{2}[/tex] = G m M / r²
we match to solve them
Gm M / R² = 2 Gm M / r²
1 / R² = 2 / r²
r =√2 R
therefore the correct answer is B