Mechanics | Relativity Answers

golfer hits a 46 g golfball with an initial velocity of 54 m/s at 25°. What are the horizontal and vertical components of momentum imparted to the ball?

While running errands, Tim drove the following distances: 1.3 km to the post office, 3.87 km to the grocery store, 4.0 km to the laundromat, and 2.15 km home. Using the rules for significant digits, which of the following is the correct total distance travelled?

A pendulum swings back forth 5 times in 30 seconds. What is the pendulum's period?

Calculate the period of a simple pendulum of length 0.5m in a place were the acceleration due to gravity is 10ms-2

Sketch an angular velocity versus time graph given the angular acceleration graph shown for the same time interval, assuming the initial angular velocity is zero.

A crane is used to lift some building materials which weigh 112 kg from the ground to the top of a building.

If the building materials are being raised by an electrical winch at a speed of 2.13 m s−1 then at what rate is the winch using electrical power? (in W to 3 s.f)

A cart travels along a frictionless roller coaster track. At point A, the cart is 10 m above the ground and traveling at 2 m/s.

a) What is the velocity at point B when the cart reaches the ground? (2 mark)





b) What is the velocity of the cart at point C when the cart reaches a height of 3 m? (2 mark)





c) What is the maximum height the cart can reach before the cart stops?

Hamad rides his skateboard at a local skate park. He starts from rest at the top of the track as seen in the figure below and begins a descent down the track, always maintaining contact with the surface. The mass of the skateboard is negligible, as is friction except where noted.

(a) What is Shawn’s speed when he reaches the bottom of the initial dip, 18.0 m below the starting point?









(b) He then ascends the other side of the dip to the top of a hill, 10.0 m above the ground. What is his speed when he reaches this point? (2 mark)

A car of mass 1.6 t travels at a constant speed of 72 km/h around a horizontal curved road with radius of curvature 190 m.
Draw a free-body diagram. What is the minimum value of μs between the road and the tyres that will prevent slippage?

Car 1 is driving three times faster than Car 2. Which of the following is true about the kinetic energy of Car 1 compared to Car 2?

A. Its kinetic energy is the same
B. Its kinetic energy is three times larger
C. Its kinetic energy is three times smaller
D. Its kinetic energy is nine times larger