Physics Answers

9. A rocket ship has a mass of 1.50 x 105 kg. Its relativistic momentum is 3.00 x 1012 kg•m/s. How fast is the rocket ship traveling?

10. How fast would a meter stick be moving so that its length will be observed to shrink to half its original length?

A flexible rectangular coil of wire with 150 loops is stretched in such a way that its dimension changes from 5 cm x 8 cm to 7 cm x 11 cm in 0.15 s in a magnetic field of 25T that is 30 degrees relative to the plane of the coil.

a. Calculate the induced EMF

b. How much energy in joules was dissipated in the circuit if the total resistance is 100Ω?

A circular antenna of an area 3m2 is installed at a place in NAIA. The plane of an area of antenna is inclined at 47% with the direction of the Earth’s magnetic field. If the magnitude of the earth’s flux linked with the antenna (1nT= 1 x 10-9 T).

A circular loop of wire of radius 0.25 cm is expected to an external magnetic field that is perpendicular to the plane of the loop. For a time, the magnetic field decreases at a rate of 0.0035 T/s. What is the magnitude of the induced electromagnetic force in the loop? 

A flexible rectangular coil of wire with 150 loops is stretched in such a way that its dimension changes from 5 cm x 8 cm to 7 cm x 11 cm in 0.15 s in a magnetic field of 25T that is 30 degrees relative to the plane of the coil.

a. Calculate the induced EMF

b. How much energy in joules was dissipated in the circuit if the total resistance is 100Ω?

A rock is thrown horizontally from the top of a cliff 88 m high with a horizontal speed of 25 m/s, what is the direction of velocity?

A stockroom worker pushes a small crate with a mass of 9.40 kg on a horizontal

surface at constant speed. The coefficient of kinetic friction between the crate and

the surface is 0.20. What horizontal force is required to maintain the motion?

A stockroom worker pushes a small crate with a mass of 9.40 kg on a horizontal

surface at constant speed. The coefficient of kinetic friction between the crate and

the surface is 0.20. What horizontal force is required to maintain the motion?

A wave is modeled by the wave function y(x,t) = (0.51m) sin[(2π/7.9m)(x-(14.3m/s)t)]. What is the period of the wave?

Round your answer to 2 decimal places.

Pls do not forget the unit

What is the wavelength of the waves you create in a swimming pool if you splash your hand at a rate of 1.41 Hz and the waves propagate at a wave speed of 5.54 m/s?

Round your answer to 2 decimal places.

Pls do not forget the unit