Answer:
2 m/s
Explanation:
Given that a student walks 4 blocks east, 1 blocks north, 2 block west and then 1 blocks south in an hour.
The total time = 1 hour
The vertical displacement = 1 - 1
Vertical displacement = 0
Horizontal displacement = 4 - 2
Horizontal displacement = 2
Total displacement = sqrt (2^2 - 0^2)
Total Displacement = 2
Average velocity = displacement/time
average velocity = 2 / 1
Average velocity = 2 m/s
Therefore, her average velocity is 2 metres per second.
The nucleus of the atom contains 8 protons and 9 neutrons. The atom is electrically
neutral. How many electrons does this atom have?
Answer:
an atom has 8 electrons
Explanation:
A boy stands on a diving board and tosses a stone into a swimming pool. The stone is thrown from a height of m above the water surface with a velocity of m/s at an angle of above the horizontal. As the stone strikes the water surface, it immediately slows down to exactly half the speed it had when it struck the water and maintains that speed while in the water. After the stone enters the water, it moves in a straight line in the direction of the velocity it had when it struck the water. If the pool is m deep, how much time elapses between when the stone is thrown and when it strikes the bottom of the pool?
Complete Question
A boy stands on a diving board and tosses a stone into a swimming pool. The stone is thrown from a height of 2.50 m above the water surface with a velocity of 4.00 m/s at an angle of 60.0 degrees above the horizontal. As the stone strikes the water surface, it immediately slows down exactly half the speed it had when it struck the water and maintains that speed while in the water. After the stone enters the water, it moves in a straight line in the direction of the velocity it had when it struck the water. If the pool is 3.00 m deep, how much time elapses between the stone is thrown and when it strikes the bottom of the pool?
Answer:
The value is [tex]t_t = 1.9182 \ s[/tex]
Explanation:
From the question we are told that
The height of the throw is [tex]h = 2.50 \ m[/tex]
The velocity is [tex]v = 4.00 \ m/s[/tex]
The angle is [tex]\theta = 60.0^o[/tex]
The depth of the pool is [tex]d = 3.00 \ m[/tex]
Generally the velocity of the stone towards the horizontal direction is
[tex]v_h = v * cos (\theta)[/tex]
=> [tex]v_h = 4.00 * cos (60.0)[/tex]
=> [tex]v_h = 2 \ m/s [/tex]
Generally the velocity of the stone towards the vertical direction is
[tex]v_v = v * sin (\theta)[/tex]
=> [tex]v_v = 4.00 * sin (60.0)[/tex]
=> [tex]v_v = 3.46 \ m/s [/tex]
Generally from kinematic equation we have that
[tex]s = v_v t + \frac{1}{2} gt^2[/tex]
Here s = -h , the reason for the negative sign is because the distance traveled is towards the negative y-axis
t is the time taken by the stone to travel through air
So
[tex] -2.50= 3.46 t + \frac{1}{2} (-9.8)t^2[/tex]
Here g = -9.8 m/s^2 because the direction of movement is in the negative y axis
=> [tex] 4.9 t^2 -3.46t - 2.50[/tex]
Solving the above equation using quadratic formula we obtain t to be
t = 1.15 s
Generally from kinematic equation
[tex]v_j = v_v +gt[/tex]
Here
is the velocity of the stone just before it hits the water
=> [tex] v_j = 3.46 + -9.8(1.15)[/tex]
=> [tex] v_j = -7.81 m/s [/tex]
The negative sign just signify's the direction of the velocity
The magnitude is
[tex] |v_j| = 7.81 m/s [/tex]
Generally the speed of the stone in water is
[tex]v_w = \frac{|v_j|}{2}[/tex]
=> [tex]v_w = \frac{7.81 }{2}[/tex]
=> [tex]v_w = 3.905 \ m/s [/tex]
The time taken to travel through the water is
[tex]t_w = \frac{d}{v_w}[/tex]
=> [tex]t_w = \frac{3}{3.905}[/tex]
=> [tex]t_w = 0.7682 \ s [/tex]
Generally the total time taken is mathematically represented as
[tex]t_t = t + t_w[/tex]
=> [tex]t_t = 1.15 + 0.7682[/tex]
=> [tex]t_t = 1.9182 \ s[/tex]
The total time taken by the stone to reach the bottom of the pool is 1.92s
The motion of the stone to the bottom of the pool:
Given information:
height above the water surface from which the stone is thrown, h = 2.5m
the initial velocity of the stone, u = 4 m/s
the angle from the horizontal θ = 60°
The vertical velocity of the stone in given by:
u' = usin60
u' = 4sin60
u' = 3.46 m/s
(i) The time taken by the stone to reach the water surface:
From the second equation of motion we get:
h = ut + ¹/₂gt²
the stone is thrown up at an angle of 60°, so the vertical velocity is upwards, the final position of the stone is at the surface of the water, which is 2.5m downwards from the position it is thrown, also the acceleration due to gravity is downwards. So if we consider upwards as a positive direction and downwards as a negative direction, we get:
-2.5 = 3.46t - 0.5×9.8t²
-2.5 = 3.46t - 4.9t²
solving the above we get:
t = 1.15 s
The vertical speed of stone when it touches the surface of water;
v = u + gt
v = 3.46 - 9.8×1.15
v = -7.81 m/s
or, 7.81 m/s downwards
(ii) Motion of the stone to the bottom of the pool:
In this case, the motion is in a straight line, and the stone descends with constant speed which is half the speed of the stone when it touches the surface of the water, so:
u = -7.81/2
u = -3.9 m/s
The depth of the pool is d = -3m
so time taken:
t' = d/u = (-3)/(-3.9)
t' = 0.77 s
So the total time taken is:
T = t + t'
T = 1.15 + 0.77
T = 1.92 s
Learn more about equations of motion:
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What type of elements are presented in the periodic table
in which of the following conditions does the velocity of the car NOT change?
(Before I ask my question, it's not physics btw idk what it is it's just science)
Since kinetic energy depends on mass and speed, will a 300-pound baseball player hit the ball farther than a 100-pound baseball player? EXPLAIN
Assume the following conditions in this scenario:
1. The bat is identical in mass and weight for both players
2. both players swing the bat with the same velocity
3. The weather conditions are identical for both players (wind, climate etc..)
4. both players meet the ball squarly so as to hit the ball in the same place for the best outcome
It's definitely a Physics question !
Here's how I would look at it:
The player doesn't hit the ball. The bat does.
You said that the two bats are identical, and both players swing the bat with the same speed.
So at the point where the bat meets the ball, the conditions are the same both times.
The ball can't tell the difference.
Its history will unfold identically after both hits.
what property of light is suggested by the formation of shadows
Answer:
Please mark me as the brainliest
Explanation:
The way shadows are formed in such a way that the shape of the shadows resembles the object is because light travels in straight lines. This means that, a light ray wouldn't just jump up the obstacle and land on the other side and then you would see some funny light spots on the shadow
Which of the following statements about developing a personal fitness program is NOT true?
A. When developing a personal fitness program, it is important to implement strategies that will help maintain the program as well as give it a successful start.
B. Personal factors such as age, health concerns, and likes are important to consider when developing a personal fitness program.
C. The starting skill level of the physical activities included in a personal fitness program should be determined from other individuals' fitness programs.
D. The FITT principle should be used when developing a personal fitness program.
gym
Which statement best describes the difference between strong nuclear forces and weak nuclear forces?
Select one:
a. Weak nuclear forces are involved when certain types of atoms break down. Strong nuclear forces are responsible for holding atoms' nucleus together.
b. Weak nuclear forces hold bonds between atoms together. Strong nuclear forces hold together the nucleus of an atom.
c. Strong nuclear bonds prevent atoms from falling apart. Weak nuclear bonds prevent compounds from falling apart.
d. Strong nuclear forces are involved in breaking electrons from their shells. Weak nuclear forces hold protons in the nucleus.
Answer:
D
Explanation:
because it is.
how do you find your spirit animal?
Answer:
Take a Buzzfeed quiz
Explanation:
I doubt finding your spirit animal is easy, so you must consult the infamous website known for random personality quizes, Buzzfeed.
I'm sure there will be many quizes focused on the exploration of spirit animals, and finding yours with accuracy is something Buzzfeed takes pride in, (despite the fact that this is a comercial buisness with the only intent of making money off of your personality quiz exploits) so your spirit animal should be found with ease.
If Buzzfeed turns out to be unsucsessful, I recomend just searching up your question online to find countless other resources dedicated to your spirit animal journey.
You could also consult your local witch to see if they know anything about spirit animals.
Answer:
i will tell you how to do it because i've done it before
Explanation:
So to find your spirit animal you don't choose it. It chooses you. To find yours it can be in your dreams, daydreams. Look into your concious. In your dreams look at the animals to see if there is anything unusal about them that is out of the ordinary. It will show itself to you in ways you might not realize. If you do see an animal out of the ordinary, inspect it, try asking it something, because if it shows itself to you that means it is willing to guide you. Thats what your spirit animal is for.
Which substance gets broken down in a himogeneous mixture?
What is the magnitude? PLSSS HELP (15 POINTS)!!
Answer:
i think the answer is -3m/s2 as there written no sign so it will be 3m/s2
Explanation:
we can see its an uniform decelaration
so we know
a=v-u/t
or a=2-26/8-0
so a =-24/8
so a=-3m/s2
A change in the gravitational force acting on an object will affect the object’s
A. Mass
B. Coefficient of static friction
C. Weight
D. Inertia
c. weight.
Explanation:
I had the exact same question
a change in gravitational force affects weight. The correct answer is: c. Weight
The gravitational force is given by the law of universal gravitation
F = [tex]G \frac{M m}{r^2}[/tex]
where F is the force, G the constant of universal attraction, M and m the mass of the two bodies, r the distance between the bodies
In the case that a body is lying on the surface of the planet, the distance is the radius of the planet, in this case the radius of the Earth
r = R_e
F = [tex]G \frac{M m}{R_e^2}[/tex]
For convenience we can define a new variable called acceleration of gravity (g)
g = [tex]G \frac{M}{R_e^2}[/tex]
we substitute
F = g m
This amount is called body weight, so a change in gravitational force creates a change in weight, therefore the correct answer is: C Weight
In conclusion a change in gravitational force affects weight, therefore the correct answer is: c. Weight
learn more about gravitational force weight here: brainly.com/question/11261073
Form hypothesis: How do you think objects will fall when there is no air?
Normally, just because there is no air we still have gravity.
Answer:
Hello!!! Princess Sakura here ^^
Explanation:
I think objects will fall at the same rate regardless of their mass.
A lamp plugged into an electrical outlet is turned on. The lightbulb in the lamp glows and gets hot. What energy transformations are taking place?
Answer: thermal and elterical
Explanation:thermal and eltrical
Answer:
Electric energy from the outlet transforms to radiant energy and thermal energy in the lightbulb.
Explanation:
Which of the following would be most likely to have individual characteristics?
(forensic science)
Answer:
D. Fingerprints
Explanation:
answers for Plato. I took the test
Can you charge an object by ripping two object apart? Pls answer quickly
Which of the following is the best definition of lifestyle activity?
a
Recreational activities such as bowling or canoeing
b
Light or moderate activities you do as part of your daily life
c
Winter activities such as snowboarding
d
Vigorous activities like a HIIT workout
What is the diameter of the sun
Answer: 865,370 miles
Explanation: I did the quiz:] Have a nice day!
True or false speed velocity and acceleration cannot be measured directly
Answer:
false
Explanation:
You turn on a car's radio. What energy transformation is taking place?
A. Chemical to kinetic
B. Thermal to kinetic
C. Electrical to sound
D. Nuclear to sound
SUBMIT
Answer:
I think C like my friend upove
Explanation:
An object accelerates from rest with a constant acceleration of 7.5 m/s2. How fast will it
be traveling after it goes 12 m?
Answer:
13.4 m/s
Explanation:
Given:
Δx = 12 m
v₀ = 0 m/s
a = 7.5 m/s²
Find: v
v² = v₀² + 2aΔx
v² = (0 m/s)² + 2 (7.5 m/s²) (12 m)
v ≈ 13.4 m/s
A water holding tank measures 85 m long,
60 m wide, and 11 m deep. Traces of mercury
have been found in the tank, with a concentration of 50 mg/L.
What is the total mass of mercury in the
tank?
Answer in units of kg.
Explanation:
Total volume of the tank
= 85 * 60 * 11
= 56100 m^3
= 56,100,000 L
1L vol. Of tank contains = 50 mg of Hg
56,100,000 L vol. of tank contains
= 56,100,000 * 50
= 2,805,000,000 mg of Hg
= 2805 kg of Hg
If a train going 60 m/s hits the brakes, and it takes the train 1 minute 30 seconds to stop, what is
the train's acceleration?
Explanation:
u=60
t=90s
a=
v=0
v=u+at
0=60+90a
90a=-60
a=-3/2
what happens when air filled balloon is left with its mouth downwards and allowed the air to escape
Answer:
As their is a high pressure inside the balloon, air would gush out of the ballon.
Due to Newton's Third Law of Motion, When this air exerts a force downwards , the surrounding medium would also exert an equal and opposite force on the ballon.. due to which it would fly upwards.
Explanation:
The same track star runs the 100 meter dash forward in only 10.1 seconds. What is
the track star's velocity?
In the elements square on the periodic table, the number with the greatest numerical value the
Answer:
Osmium
Explanation:
Because Osmium has the highest numberic value
A roller coaster pushes a 25 kg person upward with a force of 300 N. What is the acceleration?
Answer: a=F/m , a = 300N/25N , a= 12 m/s2
Explanation: Divide the 300 by 25 you get 12 . If your wondering how i got 25N in the eqaution it because you change 25kg to 25N. I hope this helps you
Acceleration of an object is the force divided by mass. The acceleration of the roller coaster to push the 25 kg person with a force of 300 N is 12 m/s².
What is acceleration ?Acceleration is a physical quantity measuring the rate of change in velocity. It is a vector quantity having both magnitude and acceleration. Acceleration has the unit of m/s².
According to Newton's second law of motion, the force acting on a body is the product of its mass and acceleration.
F = ma
Given that, mass of the person = 25 kg
force applied on the body = 300 N
acceleration = force/mass
a = 300 N/25 kg = 12 m/s²
Therefore, the acceleration of the roller coaster is 12 m/s².
Find more on acceleration:
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help me please, i need it fast
Answer:
2) C. (x - 3)² + (y + 2)² = 25
5) x² + y² - 8x - 16y + 54 = 0
6) x² + y² - 10x - 12y + 36 = 0
Explanation:
2)
center of circle = 3, -2
x1, y1
end point of circle = 7, 1
x2, y2
the equation of a circle is Pythagorean theorem
x² + y² = r² (where r is the radius of a circle)
distance between points
(x2 - x1)² + (y2 - y1)² = r²
(7 - 3)² + (1 - (-2))² = r²
r² = 25
therefore the equation to the circle is
(x - 3)² + (y + 2)² = 25
=========================================
5)
write the general form of a circle with the center (4,8)
and containing the point (-1, 7)
distance between points
(x2 - x1)² + (y2 - y1)² = r²
(-1 - 4)² + (7 - 8)² = r²
r² = 26
(x - 4)² + (y - 8)² = 26
(x - 4)(x - 4) + (y - 8)(y - 8) = 26
x² - 8x + 16 + y² - 16y + 64 -26 = 0
x² + y² - 8x - 16y + 54 = 0
=========================================
6)
find the general form of a circle with center (5,6)
and tangent to the y-axis.
center (5,6)
h, k
radius = r²
r = 5
(x - h)² + (y - k)² = r²
(x - r)² + (y - k)² = r²
(x - 5)(x - 5) + (y - 6)(y - 6) = r²
x² - 10x + 25 + y² - 12y + 36 = 25
x² + y² - 10x - 12y + 36 = 0
=========================================
_____ are tiny organisms that are made of a single cell
Carbon is most abundant in the and .
Fill the blanks
Answer: yes it is
Explanation:
