Physics Answers

How fast would the moon need to travel in order to escape the gravitational

pull of Earth, if Earth has a mass of 5.98 X 1024 kg and the distance from

Earth to the moon is 3.84 x 108 m?

Ashman pulls a 4.5 kg bucket of water from a well of 2.8 m depth by a rope. Draw a labeled free-body diagram of the bucket and find the magnitude of tension force in the rope if the upward acceleration of the bucket is 1/4 g. .

An ideal gas expands isothermally,performing 3.40×10³ J of work in the process.Calculate the change in internal energy of the gas and the heat absorbed during this expansion.

Two objects gravitationally attract with a force of 25.0N. If the distance between the two objects' centers is doubled, then the new force of attraction is ___ N

A ray of light passes from glass (ng 1.5) to water (ng 1.33) what is critical angle of incidence

A reinforced concrete square pole is to withstand a wind shear force of 450.0 kN.

Calculate the relevant cross-sectional side dimensions of the pole for a safety factor

of 9.00. [Ultimate Shear Strength of the reinforced concrete = 125 MPa]

Draw a diagram of a rectangular object under a shear force. Label your diagram.

A nylon string on a tennis racket is under a tension of 550N. If its diameter is

1.58 mm, by how much is it lengthened from its untensioned length of 45.0 cm?

Give your answer in cm. [Young’s Modulus for nylon = 5 GPa]

A Christmas ball in a shape of a hollow sphere ia hung from the tree by a piece of a thread attached to the surface of the ball. The mass and radius of the ball are 0.105kg and 0.12m, respectively. What will be its period of oscillation when slightly displaced from its equilibrium position?

Hint: l= 5/3mr²

A simple pendulum is found to vibrate 50 times within 200s. When 1.5 meter of its length is reduced to a certain length it vibrates 50 times in 175s. Find the original length of the pendulum.