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3 years ago

Which sentence best explains the difference between potential energy and

Physics

1 answer:

yan [13]3 years ago

6 0

Answer:

C. Potential energy is related to an object's position, and kinetic

Explanation:

The energy contained in the small motions of the object's molecules can be broken up into a combination of microscopic kinetic energy and potential energy.

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Earth is the only planet able to support _____.

Sergeeva-Olga [200]

Earth is the only planet able to support _____

Life

3 0

3 years ago

Two equal mass carts approach each other with velocities equal in magnitude but opposite in direction. Friction can be neglected

Viefleur [7K]

Answer:

Explanation:

Since momentum is given by:

$\vec{p}=m.\vec{v}$

Therefore momentum is a vector quantity in the direction of velocity.

Inelastic collision is the type of collision in which the masses combine after collision and start moving in the direction of the greater momentum but here in this case we have the momentum equal and opposite in direction.

This case can be described mathematically as:

$m_1.\vec{v_1}=m_2.\vec{v_2}$

since the mass and velocity are equal:

$m.\vec{v}=m.\vec{v}$

net momentum:

$p_{net}=0$

7 0

3 years ago

A certain string can withstand a maximum tension of 39. N without breaking. A child ties a 0.43 kg stone to one end and, holding

frez [133]

Answer:

Bottom of the circle.

Explanation:

At the top of the circle the tension and the weight contribute on being the centripetal force, at the middle of the circle only the tension contributes on being the centripetal force (the weight being perpendicular to it), while at the bottom of the circle the tension contributes on being the centripetal force (as always) but the weight against to it, so here is where the tension must be greater to allow the same centripetal force as the other cases, thus here is where the string will break.

6 0

3 years ago

2 Points

yulyashka [42]

The force applied to lift the crate is 171 N

Explanation:

The lever works on the principle of equilibrium of moments, so we can write:

$F_i d_i = F_o d_o$

where

$F_i$ is the force in input

$d_i$ is the arm of the input force

$F_o$ is the output force

$d_o$ is the arm of the output force

For the lever in this problem, we have:

$d_i = 0.25 m$

$d_o = 0.19 m$

$F_i = 130 N$ (force applied)

Solving the equation for $F_o$ , we find the force applied to lift the crate:

$F_o = \frac{F_i d_i}{d_o}=\frac{(130)(0.25)}{0.19}=171 N$

Learn more about levers:

brainly.com/question/5352966

#LearnwithBrainly

6 0

3 years ago

Please help!!! A river has a constant current of 3 km per hour. If a motorboat, capable of maintaining a constant speed of 20km

PilotLPTM [1.2K]

Construct a vector diagram. It will be a right-angled triangle. One vector (the hypotenuse) represents the heading of the boat, one represents the current and one represents the resultant speed of the boat, which I'll call x. Their magnitudes are 20, 3 and x. Let the required angle = theta. We have:

theta = arcsin(3/20) = approx. 8.63° 

The boat should head against the current in a direction approx. 8.63° to the line connecting the dock with the point opposite, or approx. 81.37° to the shore line. 

x = sqrt(20^2 - 3^2) 
= sqrt(400 - 9) 
= sqrt 391 

The boat's crossing time = 
0.5 km/(sqrt 391 km/hr) 
= (0.5/sqrt 391) hr 
= approx. 0.025 hr 
= approx. 91 seconds

4 0

3 years ago