Physics Answers

Rich Gossage set a fastball record by hurling a 0.14 kg baseball at a speed of 46.3 m/s. What was the magnitude of the ball’s momentum as it left his hand? *

What is the mass of a bus moving at a velocity of 110 kph if it has to fully stop before an intersection if a 7000-N of force is applied on it in 15 seconds? *

A golf ball with a mass of 0.06 kg is subjected to an impulse that causes it to move with a velocity of 50 m/s. If the golf club and the ball are in contact for 5x10^-3 second, what average net force acts on the ball? 

A rectangular surface with horizontal dimensions of 4.0 cm and 5.0 cm is found in a uniform magnetic field directed at a 40° angle above the horizontal. Calculate the magnitude of the magnetic field that will yield a flux equivalent to 6.17 ✕ 10 -4 Wb.

A balloon has a volume of 25.0L on a day when the temperature is 30.0 °C. If the temperature at night falls to 10.0 °C, what will be the volume of the balloon if the pressure remains constant?

Hilda Spellman was baking a pie for Sabrina’s 16th birthday, when the dough won’t roll flat on the kitchen table. She hit the 20 cm dough flat using a spatula moving at a velocity of 30 m/s downward, until the dough is 5 mm thick. The dough remained immobile throughout the process.

1. If the spring constant of the dough is equal to 50, what is the momentum of the dough?
2. What kind of collision is observed in the scenario?

How much energy in KWH is consumed by 600 watt bulb running for 20 hours

A mass of 0.750 kg is hung from a vertical spring with a spring constant of 20 N/m. After coming to equilibrium the mass is then pulled down an additional distance 10 cm and then released from rest. The mass then oscillates from position 3 to 4 to 5 to 4 and back to 3 over and over.

A) List the types of nonzero energy that the system has at xmin (Position 5). B) Calculate xeq.

C) Calculate hmax.

D) Calculate the total energy of the system at xmax (Position 3).

E) Calculate the maximum speed.

F) Calculate the amounts of EK, Eg, and ES when the mass is 4.00 cm above the equilibrium position.

G) Explain two ways that the maximum speed can be decreased

Some workers re-roofing a building are using a slide to get material from the roof to a bin beside the building.

Assume that the slide is frictionless and that the material being slid down starts at the top of the slide at rest.

If the bin is 4.4 m vertically below the top of the slide then at what speed will the material enter the bin? (in m s−1 to 2 s.f)

(a) Find the net electrostatic force at sphere B. (b) Find the net electric field at (4,-3)