Physics Answers

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).

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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?

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A race car accelerates uniformly from

18.5 m/s to 23.6m/s in 21seconds.

Determine the acceleration of the car

and the distance traveled.

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?

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A system takes in 0.380 kJ of heat while it does 0.790 kJ of work on the surroundings. What is the change in internal energy of the system?

A pot containing 1.50 kg of water is sitting on a hot stove, and the water is stirred violently by a mixer that does 8.20 kJ of mechanical work on the water. The temperature of the water rises by 4.00°C. What quantity of heat flowed into the water from the stove during the process? The specific heat of water is 4.186 kJ/kg·K. 

A proton moves through a magnetic field of magnitude 4.5 T at a speed of 7.08×10^6 m/s

Perpendicular to the field. Find the

a. Centripetal acceleration

b. Radius of the circular path of the proton

Determine the refracted index of a certain piece of glass if the speed of light in it is 1.90x10^8 m/s

what is the heat capacity of 100 kg of a coolant that has a specific heat capacity of 2420 J/KgK

A force acts on a 2-kg mass and gives it an acceleration of 3 m/. What acceleration is produced by the same force when acting on a mass of (a) 1 kg? (b) 4 kg? (c) How large is the force?