Other Physics Answers

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?

A ball with mass of 0.2 kg collides with wall with a speed of 10 m/s at a right angle and rebounds with the same speed in the opposite direction. If the contact time between the ball and the wall is 0.1 s. What is the force exerted on the ball by the wall?