Answer:
c. violet, because it has the shortest wavelength
when a object is at rest, what is it’s speed??
Answer:
0 (there is no speed)
Explanation:
If an object is at rest, it is not moving, and it doesn't have a speed, so the speed is zero.
Answer:
the speed when object at rest is 0 m/s
A 500 g block of metal absorbs 5016 J of heat when its temperature changes from 20.0°C to 30.0°C. Calculate the specific heat of the metal.
Explanation:
the answer is
s= 1.0032 J/ g .C
The specific heat of the metal is 1.0032 J/ g .C.
What is specific heat?The quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree.
The formula is Cv = Q / (ΔT ⨉ m) Here, Q = absorbed heat = 5016 JMass m = 500gΔT = t1 - t2 = 30 - 20 = 10°CPutting above values in the equation we get,
Cv = 5016/(500 x 10)
Cv = 5016/5000
Cv = 1.0032J/g .C
Thus , the specific heat of the metal is 1.0032 J/ g .C.
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All of the following are reasons that psychologists use a systematic method to conduct research except __________.
Answer: To help eliminate subjectivity
Explanation:
Edgenuity 2020
12 A plane starting from rest accelerates at 3 m/s for 25 s. Calculate the
increase in velocity after:
a 1 s
b 5s
C 25 s.
Answer: 78m/s =A
u=0 ,a=3m/sec^2 ,t=25sec
v=u+at
=0+25×3
=75m/s
after 1sec
v=u+at+75
=0+3×1+75
=78m/s
Explanation:
u=0 ,a=3m/sec^2 ,t=25sec
v=u+at
=0+25×3
=75m/s
after 1sec
v=u+at+75
=0+3×1+75
=78m/s
As shown in the figure below, a squirrel is looking for nuts. it runs rightward 10m and runs leftwards another 20m to a second nut. The total time spent running was 12s. What is the squirrels average velocity to reach the second nut?
Answer:
Average velocity = 0.83 m/s
Explanation:
Computation:
Total displacement = 20 - 10 = 10 m
Time taken = 12 second
Average velocity = Total displacement / Time taken
Average velocity = 10 /12
Average velocity = 0.83 m/s
Answer:
Velocity: -0.83
Average speed: 2.5
Hi guys :( Can u please help me? Im really bad at this fr :( I would appreciate if you guys help me, I put the picture
To completely describe the motion of an object, you need
A. position B. speed C. direction of motion D. All of the above
To completely describe the motion of an object, you need position, speed and direction of motion. Hence, option (D) is correct answer.
What is motion?In physics, motion is the alteration over time of a body's position or orientation. Translation is defined as movement along a line or a curve. Rotation is a motion that modifies a body's orientation. In all scenarios, the acceleration and directed speed of every point on the body are equal (time rate of change of velocity).
Every movement has a frame of reference to which it is relative. A body is not in motion when it is said to be at rest; rather, it is being characterised in relation to a frame of reference that is moving with the body. Hence, position, speed and direction of motion are needed to completely describe the motion of an object.
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A box is being pulled by two ropes. Eduardo pulls to the left with a force of 500 N, and Clara pulls to the right with a force of 200 N. The box moves because of the two forces applied to it. Leon records the forces and direction of the forces acting on the box in his lab notebook. A 2 column table with 5 rows. Column 1 is labeled Force with entries Normal, Tension by Eduardo, Tension by Clara, Kinetic friction, Gravity. Column 2 is labeled Direction of Force Vector with entries Upward, Left, Right, Left, Downward. In the table, which force has the wrong direction? Tension by Eduardo Tension by Clara Kinetic friction Gravity
Answer:
kinetic friction or something else
Explanation:
Draw a diagram to illustrate the problem, as shown below.
m = mass of the box, kg
mg = weight of the box, N, acting downward
Because of Newton's 3rd law, a normal force of N = mg acts upward on the box.
C = 200 N, the force applied by Clara, horizontally to the right
E = 500 N, the force applied by Eduardo, horizontally to the left.
Because E is greater than C, the box will move left.
The frictional force, F, will resist the initial motion. Its magnitude is
F = μN = μmg, where μ = kinetic coefficient of friction.
F acts horizontally to the right.
From the given table, we can conclude that
Normal force acting upward is correct
Tension by Eduardoacting left is correct.
Tension by Clara acting right is correct.
Kinetic friction acting left is Incorrect.
Gravity acting downward is correct.correct
Answer:
The direction of the kinetic friction force is incorrect
Answer:
C) Kinetic Friction
Explanation:
Got it right on edg 2021
A turtle ambles leisurely, as turtles tend to do, when it moves from a location with position vector ????1,x=1.33 m and ????1,y=−2.89 m in a lettuce garden to another location, with position vector ????2,x=3.07 m and ????2,y=−4.33 m, where the lettuce appears to be tastier (but really is not; this turtle cannot see very well). The excursion takes 327 s to complete. What are the components and the magnitude of the turtle's average velocity in meters per second?
Answer:
v = 22.68 10⁻³ m / s
vₓ = 5.32 10⁻³ m / s , v_{y} = 22.08 10⁻³ m / s
Explanation:
Velocity is defined by
v = Δs / Δt
let's calculate for each axis
X axis
vₓ = (3.07 - 1.33) / 327
vₓ = 5.32 10⁻³ m / s
Y axis
[tex]v_{y}[/tex] = (4.33 - (- 2.89)) / 327
v_{y} = 22.08 10⁻³ m / s
the magnitude of the velocity can be calculated using the Pythagoras theorem
v² = vₓ² + v_{y}²
v = √ (vₓ² + v_{y}²)
v = √ (5.32² + 22.05²) 10⁻³
v = 22.68 10⁻³ m / s
How do the earths layers compare to other planets in the solar system?
Answer:
Earth is made mostly of silicate rock in its crust and mantle, iron-nickel metal in the core. This is like some other planets -- but very unlike others.
Which bullet will hit the ground first ?
Answer:
they hit at the same time
Explanation:
Gravity works on both bullets the same.
An electric kettle is rated at 2 kW when connected to a 230 V electrical supply
a Calculate the current when the kettle is turned on.
b What value fuse should be included in the circuit of the kettle?
(Assume that the fuses available are 3 A, 5A and 13 A.)
c Modern kettles often have double insulation. Explain what this means
and how it provides extra safety for the user.
d ) Calculate the resistance of the heating element of the kettle.
Explanation:
a) P = IV
2000 W = I (230 V)
I = 8.7 A
b) The fuse must be rated for a higher current than the kettle, so use the 13A fuse.
c) Double insulation means there are two layers of insulation, insuring that the wires cannot touch the outer casing of the kettle and protecting the user from electrical shock.
d) V = IR
230 V = (8.7 A) R
R = 26.5 Ω
A beaker (glass jar) contains 1 kg of water; when converted to a volume measurement it is the same as:
1,000 mL
1,000 L
1,000 cm 3
Pick more than 1
Answer:
a and c
Explanation:
didn't actually do the math, but i am pretty positive that those are equal
What do (3.9 x 10^2)(4.1 x 10^4) equal
Answer:
Explanation:(3.9x100)(4.1x10,000)
390x41,000
15,990,000
Question 2 (1 point)
A tennis ball rolls off the edge of a table. the table is 0.55m tall and the tennis ball
lands 0.12m away from the table.
3
What is the initial vertical velocity?
0 m/s2
9
.12m
O m/s
-9.8m/s2
h
Question 3 (1 point)
Answer:
The initial vertical velocity is zero, u = 0 m/s
Explanation:
Given;
height of the table, h = 0.55 m
horizontal distance traveled by the tennis, x = 0.12 m
Apply the following kinematic equation;
h = ut + ¹/₂gt²
where;
u is the initial vertical velocity = 0, since the tennis ball rolled off the edge of a table.
h = ¹/₂gt²
The time to fall from the vertical height is given by;
[tex]t = \sqrt{\frac{2h}{g} } \\\\t = \sqrt{\frac{2(0.55)}{9.8} }\\\\t = 0.335 \ s[/tex]
The initial horizontal velocity of the tennis is given by;
x = vₓt
vₓ = x / t
vₓ = (0.12) / (0.335)
vₓ = 0.358 m/s
Therefore, the initial vertical velocity is zero, u = 0 m/s and initial horizontal velocity, vₓ is 0.358 m/s
Below is an "oracle" function. An oracle function is a function presented interactively. When you type in a t value, and press the --f--> button the value f(t) appears in the right hand window. There are three lines, so you can calculate three different values of the function at one time. The function f(t) represents the height in feet of a ball thrown into the air, t seconds after it has been thrown. Calculate the instantaneous velocity 1.02 seconds after the ball has been thrown. Instantaneous velocity at 1.02 =
Answer:
The rate of change of height with respect to time is -10.64 feet/sec
Explanation:
Given that,
There are three lines, so you can calculate three different values of the function at one time.
The function f(t) represents the height in feet of a ball thrown into the air, t seconds after it has been thrown.
Given table is,
Time t = 0, 1, 1,02
Function is,[tex]F(t)=-3.053113177191196\times10^{-18},6.000000000000134, 6.41760000000015[/tex]
We need to calculate the initial height of ball
Using equation of motion
[tex]h=h_{0}+ut-\dfrac{1}{2}gt^2[/tex]
Where, h₀ = initial height
u = initial velocity
t = time
g = acceleration due to gravity
At t = 0,
Put the value into the formula
[tex]-3.053113177191196\times10^{-18}=h_{0}+0-0[/tex]
[tex]h_{0}=-3.053113177191196\times10^{-18}[/tex]
We need to calculate the height of ball at t = 1
Using equation of motion
[tex]h_{1}=h_{0}+u_{0}t-\dfrac{1}{2}gt^2[/tex]
Put the value in the equation
[tex]6.000000000000134=-3.053113177191196\times10^{-18}+u-\dfrac{1}{2}\times32[/tex]
[tex]6.000000000000134+3.053113177191196\times10^{-18}+16=u_{0}[/tex]
[tex]u_{0}=22\ feet/s[/tex]
Velocity is the rate of change of height with respect to time
So, velocity at 1.02 sec is given
We need to calculate the height
Using equation of motion
[tex]h=ut-\dfrac{1}{2}gt^2[/tex]
On differentiating w.r.to t
[tex]h'(t)=u-\dfrac{1}{2}g(2t)[/tex]
Put the value into the formula
[tex]h'(t)=22-\times32\times(1.02)[/tex]
[tex]h'(t)=-10.64\ feet/sec[/tex]
Hence, The rate of change of height with respect to time is -10.64 feet/sec.
Please help :((((((((
First column (left side):
1 g
1600 mm
0.109 kg
0.250 km
14,000 m
1,000 mL
4.80 m
0.027 kg
What would you expect to happen to the acceleration if all friction were removed from the ramp, making the net force even higher than 600 N?
Answer:
if the friction was removed from the ramp, the acceleration would drasticly increase, making it hard to stop.
Explanation:
Astronauts appear weightless while working in the International Space Station because
A) they are in a state of free fall.
B) there isn't any gravity in outer space.
C) they have very little mass when in outer space.
Eliminate
D) they have gravitational attractions to the sun and moon
A) they are in a state of free fall.
A child attempts to roll a ball up a long ramp and it slows as it goes up. If it is released at 2.5 m/s upward and accelerates downward at 0.8 m/s2, how fast is the ball moving after 4 seconds?
Answer:
-0.7 m/s
Explanation:
Initial velocity (u)= 2.5 m/s
Acceleleration (a)= -0.8 m/s^2
Time taken (t) = 4 seconds
Hence,
v=u+at [1st Equation of motion]
v=2.5+-0.8*4
v=2.5-3.2
v=-0.7 m/s
Note that the negative sign indicates that the ball has changed direction and rolls downwards with gravity
A spacecraft is launched from Earth toward the moon. Where will the spacecraft be when the gravitational forces acting on it are equal? closer to Earth than to the moon because the moon has greater mass than Earth closer to the moon than to Earth because the moon has greater mass than Earth closer to Earth than to the moon because Earth has greater mass than the moon closer to the moon than to Earth because Earth has greater mass than the moon
Answer:
D
closer to the moon than to Earth because Earth has greater mass than the moon
Explanation:
Answer:
D
Explanation:
How is the kinetic energy of the particles that make up a substance different
after it changes state?
A. The kinetic energy is less after a substance changes from liquid to a gas
B. The kinetic energy is less after a substance changes from gas’s to a liquid
C. The kinetic energy is greater after a substance changes from a liquid to a solid
D. The kinetic energy is greater after a substance changes from a plasma to a gas
We have that The kinetic energy is less after a substance changes from gas’s to a liquid
Because Liquid state is a more rigid or tightly held state for atom of a substance
Option B
From the question we are Given
The kinetic energy is less after a substance changes from liquid to a gas The kinetic energy is less after a substance changes from gas’s to a liquid The kinetic energy is greater after a substance changes from a liquid to a solid The kinetic energy is greater after a substance changes from a plasma to a gas
Generally
Kinetic energy of a substance changes as it changes state.Kinetic energy is the energy possessed by an object in motion.
Therefore
The four states which are Plasma,Solid liquid and gaseous state allow greater kinetic energy the lighter there bond.
Therefore
The kinetic energy is less after a substance changes from gas’s to a liquid
Because Liquid state is a more rigid or tightly held state for atom of a substance
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13. An airplane travels at a constant speed of 800 kilometers per hour (km/h).
Approximately how long will it take the airplane to travel 200 kilometers?
Answer:
The time taken for the airplane to cover the distance is 15 minutes.
Explanation:
Given;
velocity of airplane, u = 800 km/h
distance traveled by the airplane, s = 200 km
The time of this motion is given by;
s = ut + ¹/₂at²
at constant velocity, acceleration, a = 0
s = ut
t = s / u
t = (200 km) / (800 km/h)
t = 0.25 hour = 15 mins
Therefore, the time taken for the airplane to cover the distance is 15 minutes.
A hockey player strikes a puck, giving it an initial velocity of 15.0 m/s in the positive x-direction. The puck slows uniformly to 6.20 m/s when it has traveled 45.0 m. (Take the direction of initial motion as the positive direction. Indicate the direction with the sign of your answer.) (a) What is the puck's acceleration? (b) At what velocity is it traveling after 2.80 s? (c) How long does it take to travel 45.0 m?
Answer:
a. -2.07 m/sc^2
b. 9.204
c. 4.25 seconds
Explanation:
a. The computation of puck's acceleration is shown below:-
[tex]V^2-Vo^2 = 2as\\\\ (6.20)^2 - (15)^2 = 2 a 45.0\\\\[/tex]
38.44 - 225 = 90a
= -2.07 m/sc^2
b. The computation of velocity is shown below:-
[tex]v = Vo + at[/tex]
= 15 - (2.07) × 2.80
= 9.204
c. The computation of long which take to travel is shown below:-
= (v - u) ÷ a
= (6.2 - 15) ÷ (-2.07)
= 4.25 seconds
We simply applied the above formulas so that the correct answers could be come
A student hangs a weight on a Newton meter
Answer:
the energy currently stored in the spring in the newton meter is 0.045N. the student then increases the weight in the newton meter by 2N
The plate near the Artic Ridge is among those with the slower growth rates, moving slightly less than 2.5 cm/year. How much will the plate move in 10 years?
Answer:
B
Explanation:
George ran 50 meters to the right and then
turned around and ran 50 meters back to the
left. What is his total displacement?
a
100 meters left
b
50 meters left
С
50 meters right
d
O meters
Answer: d, o meters
Explanation:
what forces are acting upon a coasting car
Answer:
f grav and f norm
Explanation:
a car of mass 1200kg travelling at 30m/s runs into the back of a stationary
lorry. The car and lorry move at 4m/s after impact. Determine the mass of the
lorry.
Answer:
The mass of the lorry 7800 kg
Explanation:
Momentum conservation law for inelastic collision:
[tex]m1*V1 + m2*V2 =( m1 + m2)*V^{'} \\ \\1200*10^{3} g * 30 m/s + m2*0 m/s =(1200*10^{3} g + m2)*4 m/s\\ \\\frac{1200*10^{3} g * 30 m/s}{4 m/s} -1200*10^{3} g=m2\\ \\m2=9000*10^{3} g-1200*10^{3} g=7800*10^{3} g=7800 kg[/tex]
What is the main reason some people don’t stretch before exercising?
They don’t like to stretch.
They don’t need to stretch.
They are young.
They don’t know they should stretch.
Explanation:
They don’t like to stretch.
