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3 years ago

Which student is doing work?

Physics

2 answers:

Vilka [71]3 years ago

8 0

Answer:

hope this helps

Explanation:

Alja [10]3 years ago

5 0

Answer: C, B

Explanation:

A-Rebecca is just leaning so she isn't doing any work.

B-Marcus is lifting, so that's work.

C-Starr is carrying so that's work too

D-Louis is only studying, he isn't doing nothing that he could make any work

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A top fuel drag racer reaches a maximum speed of 330 mph at the end of the 1/4-mile (402 m) racetrack. Part A - Assuming that th

Aloiza [94]

Answer:

a. 27 m/s2

b. 2.75:1

Explanation:

Since it is assumed that the race car starts from rest, initial velocity, u = 0 m/s

At the end of 402 m, distance, s = 402 m; and

Final velocity, v = 330 m/h

Converting this to m/s,

$v=\dfrac{330\times1609}{3600}=147.5$ m/s

Using the equation of motion

$v^2=u^2+2as$

$a=\dfrac{v^2-u^2}{2s}$

$a=\dfrac{147.5^2-0^2}{2\times402}=27$

If acceleration due to gravity is taken as 9.8 m/s2, then

$a:g=27:9.8=2.75:1$

4 0

3 years ago

Use the equation d=m/v. If a rock has a density of 2g/cm^3 and a volume of 8cm^3, what is the mass?

Ray Of Light [21]

Answer:

The mass is 16 [g]

Explanation:

We have to remember the formula that defines density, which mentions that the density is equal to mass divided by the volume.

$Density = mass / volume\\where:\\density = 2[\frac{g}{cm^{3} } ]\\Volume = 8 [cm^{3}]$

Now we clear the mass:

$mass= density*volume\\mass = 2[\frac{g}{cm^{3} }]*8[cm^{3} ]\\mass = 16 [g]$

8 0

3 years ago

Which term describes energy stored inside the nucleus of an atom?

Ksju [112]

Nuclear energy that what I think it is

7 0

3 years ago

A positive rod is touched to a neutral sphere. There is a bar with positively charged particles attached to a ball with positive

solong [7]

Answer: A is correct

It is showing the direction that protons move in, making the sphere negative

Explanation:

From the figure, since the charges on the rod are completely positive, it shows that the protons are transferring from the sphere to the rod leaving the rod negatively charged.

Therefore, It is showing the direction that protons move in, making the sphere negative.

4 0

3 years ago

A football is kicked from the ground with a speed of 16.71 m/s at an angle of 49.21 degrees. What is the vertical component of t

Svetllana [295]

If a football is kicked from the ground with a speed of 16.71 m/s at an angle of 49.21 degrees, then the vertical component of the initial velocity would be 12.65 m/s

<h3>What is Velocity?</h3>

The total displacement covered by any object per unit of time is known as velocity. It depends on the magnitude as well as the direction of the moving object. The unit of velocity is meter/second.

As given in the problem A football is kicked from the ground with a speed of 16.71 m/s at an angle of 49.21 degrees

The horizontal component of the velocity is given by

Vx = Vcosθ

The vertical component of the velocity is given by

Vy = Vsinθ

As we have to find the vertical component of the velocity given that speed of 16.71 m/s at an angle of 49.21 degrees from the ground

Vy = 16.71 × sin49.21°

Vy = 12.65 m/s

Thus, the vertical component of the velocity would be 12.65 m/s

Learn more about Velocity from here

brainly.com/question/18084516

#SPJ1

4 0

2 years ago