Other Physics Answers

a ball is thrown horizontally with an initial speed of 10ms from an 80 m cliff.how long does it take to reach the ground?

5 m wire made of gold ( ρgold = 2.4 x 10−8 ) has a cross-sectional area of 2 mm.

Calculate the voltage if a 32 A current runs through the wire.

What is the momentum of a 0.04kg bullet moving north at a rate of 1500m/s?

What are the given:

What is asked in the problem:

Formula to use.

Solution:

The ball dropped at 7m building has a velocity of 2.5m/s, it reaches the ground at

10.2s? What is the distance travelled by the ball?

What are the given:

What is asked in the problem:

Formula to use:

Solution:

A 60N motor winds a cable around a drum. (I) If the cable lifts a 3-ton load of bricks to a height of 12cm in 5 sec, calculate the efficiency of the motor. (II) At what rate is work done against friction?

An improvised billiard ball is used in a local play where a 35 gram billiard ball resting in a corner is suddenly

hit by another 45 grams ball moving 0.5 m/s. After the collision, the 45 grams ball remains at rest while the

other ball moves away. Find the velocity of the ball moving away ?

If the gravitational field strength at the top of Mount Everest is 9.772 N/kg, approximately how tall (in

feet) is the mountain?

Two stones are thrown vertically upward from the ground, one with three times the initial speed of the other. (a) If the faster stone takes 10 s to return on the ground, how long will it take the slower stone to return? (b) If the slower stone reaches a maximum height of H, how high (in terms of H) will the faster stone go? Assume the two stones are freely falling objects. 

A 4.0-g bullet leaves the muzzle of a rifle with a speed of 340 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.75-m-long barrel of the rifle?

A 1450-kg

 car is traveling with an initial speed of 24.0 m/s.

Determine the car's speed after −1.90 ✕ 10⁵ J

 of net work is done on the car.

Question 5.2b:

A 11.8-kg

 box is sliding across a horizontal floor. It has an initial speed of 1.45 m/s

 and the only force acting on it is kinetic friction with magnitude f_k = 2.65 N.

Determine the distance the box will travel before coming to rest.