Question

1) a)You are asked to find the initial velocity of a steel ball from a spring loaded launcher. You place the launcher on the edge of a table 1.0 meter above the floor and launch the projectile several times horizontally. If you find that the average distance the ball travels is 1.3 meters, what is the initial velocity of the ball?
To solve a problem like this, use equations for the y-motion to find the time and then the x-motion to find the velocity.
time =  
velocity =  

You now place the launcher on the floor and shoot a steel ball at an angle of 45°.
What is the y component of the velocity?
vy =  
How long is it in the air?
time =  
What is the x-component of the velocity?
vx =  
How far from the launcher do you expect the ball to hit the floor?
distance =

b)The Earth orbits the Sun once per year.
a. Assuming a circular orbit, how far does the Earth travel in one year?

b. What is the Earth's tangential velocity?

c. What is the centripetal acceleration of the Earth?

d. What is the centripetal force keeping the Earth in orbit?

T = 1 year (convert to seconds)
r = 1.5e+11 meters
m = 6e+24 kg

Answer 1