Other Physics Answers

A baseball leaves the bat at an angle of 37° above the horizontal at a speed of 120 ft/s. How high does it go? How far forward is it at its highest point?

a normal force of 35 N acts over an area of 12.5cm² what is the pressure exerted by the force?

1. A motorcycle begins driving from at rest position. It accelerates at 8 km/hr2 for 20 seconds, then travels at a steady speed for another 20 seconds, all in the same direction. How much distance has it covered since it started driving?

2. An object is dropped from a cliff, the time it takes to hit the ground is 3 seconds. What is the height of the cliff? What is the velocity of the object before it hits the ground?

You are thrown from a motorcycle and skid in a straight line to a complete stop on a rough

gravel path. A measurement of the bloody skidmark reveals that it is 11 m long. What is

the average force did the gravel exert on your body? Assume that your mass is 55.0 Kg

and your initial speed was 30 km/h.

Three forces F1 , F2 , and F3 act on an object with mass 25 kg.

The forces are the following:

F1 = 3i 6j + 3k

F2 = 5i + 9j + 2k

F3 = 6i + 3j - 6k ,

where the forces are measured in Newtons. (a) What is the net force vector? (b) What is

the magnitude of the net force? (c) What is the acceleration vector? (d) What is the

magnitude of the acceleration vector?

"The magnitude of the force between two charges of 1.5µc each that 5cm apart."

In the magnetic field B with strength 3T, what is the magnitude of a force on the charge q 2C moving at the velocity of 500 m/s in the north direction?

A 48 kg mass is sitting on a frictionless surface. An unknown constant force pushes the mass for 3 seconds until the mass reaches a velocity of 3.7 m/s.

a) What is the initial momentum of the mass?

b) What is the final momentum of the mass?

c) What was the force acting on the mass?

d) What was the impulse acting on the mass?

A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 74.3 m/s² for 1.80 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude (above the ground) will the rocket reach?

A car starts from rest and reaches a speed of 45km/hr in 20s. it travels at this speed for ½ a kilometre and then comes to rest uniformly in 30 s Find;

a)Acceleration

b)total distance traveles