Other Physics Answers

The speed of a ball bearing falling through treacle:

A) Decreases with distance fallen.

B) Increases with distance fallen and reaches a maximum.

C) Is constant.

D) Reaches a maximum and then decreases.

Which of the following is not true?

A) The pressure of a fluid increases with depth.

B) The pressure of a fluid increases with the width of the container.

C) The pressure of a fluid acts in all directions.

D) The pressure of a fluid depends on its density.

What is the viscous drag acting on a sphere with a diameter of 16.2 mm falling through water at 2.3 ms^-1? Take the viscosity of the water to be 1.1 x 10^-3 Nsm^-2.

A 3.9 x 10^-4 N

B 7.7 x 10^-4 N

C 0.39 N

D 0.77 N

The volume of water (ρ = 1000 kgm^-3) that would need to be displaced to keep a person of mass 60 kg afloat on a lake on the moon Europa is:

A 0.06 m³

B 0.589 m³

C 5.89 m³

D There is not enough information in the question.

Atmospheric pressure at sea level is 101 kPa and the density of sea water is 1020 kgm^-3, therefore the total pressure 42 m underwater is:

A 420 kPa

B 521 kPa

C 4327 MPa

D 144 kPa

what is the electric flux passing through a Gaussian surface that contains 2 protons and 1 electron?

Dry air can support a maximum electric field strength of about 10 x 10^6 V/m. The field creates enough ionization in the air to make the air a conductor. what is the the voltage between two parallel conducting separated by 2.5 cm of dry air

3. An electric generator consists of 100 turns of wire formed into a rectangular loop 50.0 cm by 30.0 cm, placed entirely in a uniform magnetic field with magnitude B = 3.50 T. What is the maximum value of the emf produced when the loop is spun at 1000 rev/min about an axis perpendicular to B ?

1. A UHF television loop antenna has a diameter of 11 cm. The magnetic field of a TV signal is normal to the plane of the loop and, at one instant of time, its magnitude is changing at the rate 0.16 T/s. The magnetic field is uniform. What emf is induced in the antenna?

A steady current of 0.5A flows through a wire.

a. How much charge passes through it in one hour?

b. What is the number of electrons that pass through the wire during this time?