Physics Answers

A loop of wire is placed in a magnetic field of uniform strength

3.0 T that is parallel to the normal of the loop. The area of the loop begins

shrinking at the rate of 2.0 m^2/s. What is the magnitude of the emf

induced in the loop while it is shrinking?

A solid cylinder of mas 4kg and radius 40cm rotates about its axis with a frequency of 1/pi what is its rotational kinetic energy?

An object starts from rest with constant accelration 26m/s^2 a long a linear line. Find the distance travelled in 10th second?

. A helium-filled balloon rises until its density becomes the

same as that of the surrounding air. If a sealed submarine

begins to sink, will it go all the way to the bottom of the

ocean or will it stop when its density becomes the same as

that of the surrounding water?

At the center of a sphere of radius 0.5m a point charge of 2 nC is placed. What electric flux is passing through the sphere?

A freezer has a coefficient of performance of 2.40. The freezer is to convert 1.80 kg of water at

25.0°C to 1.80 kg of ice at -5.0°C in one hour. (a) What amount of heat must be removed from the

water at 25.0°C to convert it to ice at -5.0°C (b) How much electrical energy is consumed by the

freezer during this hour? (c) How much wasted heat is delivered to the room in which the freezer

sits?

the mass of a typical car is m= 1000 kg, so its weight on earths surface is mg=9800N. suppose you have two containers, one with N electrons and another with N protons. these two containers are placed a distance 10m apart, and the electric force between them is equal to the weight of the car. Find N

Calculate the time for an atomic system for which that system can have the excitation energy for

the spectral line of width 10-4Å at wavelength 6000Å.

 Determine how much mass (in kg) of ²³⁵Uranium is required to provide 300 MW of thermal power in a 24-hour period.

3. How much work must be done to a proton to accelerate it from rest to 0.998c.

4. A person on Earth observes a space ship approaching from the right with a velocity of 0.75c and a rocket ship approaching from the left at 0.50c. What is the relative velocity of the two ships as measured by a passenger in each of them?