What will be the ratio between the initial and final kinetic energy of a car, if its velocity is tripled?

A ball is dropped from the top of a building. What is the velocity of the ball after 4.2 seconds

Svetach [21]

Answer:

41.16 m/s

Explanation:

Final velocity is equal to gravity multiplied by time; v = gt

Gravity is always 9.8 m/s/s (m/s^2), so

v = 9.8 * 4.2

v = 41.16

5 0

3 years ago

If you have 4 engines on an aircraft and then lose Engine 1 and 2, which are on the left side of the aircraft, will the aircraft

erik [133]

The aircraft will have a strong tendency to yaw to the left.
You'll need to compensate by applying constant right rudder.
Good luck. You're going to need it.

4 0

3 years ago

Read 2 more answers

A boy exerts a force of 9.0 N horizontally to push his sister on a sled. He pushes her through a distance of 15 m. How much work

MrRa [10]

Answer:

Work done by the boy is 135 J and is positive work.

Friction is the force acting that stops the sled and her sister.

Work done by friction is negative work.

Explanation:

Given:

Force acting on the sled by the boy is, $F=9.0\ N$

Displacement of the sled in the direction of force is, $S=15\ m$

We know that, positive work is said to be done by a force, if the force causes displacement in its own direction. Also, negative work is said to be done by a force, if the force causes displacement in the direction exactly opposite to the direction of the applied force.

Here, the force applied by the boy causes a displacement in the direction of the applied force. So, work is positive and is given as:

Work = Force × Displacement

$Work=F\times S\\Work=9\times 15=135\ J$

Therefore, the work done by the boy is positive and equal to 135 J.

Now, when the force of push is removed, then the body will experience only the frictional force in the opposite direction which eventually causes the sled to stop.

Here, the direction of force is backward while the displacement is in the forward direction. So, both of them are in opposite direction.

So, work done by frictional force is negative.

6 0

4 years ago

During which weeks of the moon cycle does the moon appear to be getting smaller

nadezda [96]

Answer:

Since the illuminated side of the moon appears to be getting smaller in size (after the full moon), the moon is said to be in the "erosion phase". For the next 7 days, the moon will remain in an “eroded gibbous stage”.

Explanation:

6 0

2 years ago

A force of 6N is exerted on a cart that is carrying a rock and produces an acceleration of 2 m/s2. If the cart has a mass of 1 k

vaieri [72.5K]

If you use the equation F=ma and re-arrange it to get m = F/a, you'll get the total mass. Then you have to subtract the mass of the cart from the total mass to get the mass of the rock.

Thus, m = 6N over 2m/s^2. The total mass will then be 3kg. Subtracting 1kg from the total mass will then yield you 2kg, which is the mass of the rock. Hope this helps.

6 0

3 years ago