Physics Answers

A large horseshoe magnet produces a magnetic field of strength 2×10−2 T in the region between the poles of the magnet. A wire of 5 cm length is placed in the field at the right angle to the field lines and carries a current of 15 mA. Calculate the force acting on a wire.

The mechanical power output of a cyclist moving at a constant speed of 6.60m/s on a level road is 124W. What is the force exerted on the cyclist and the bicycle by thr air?

A 6.00-kg piece of solid copper metal at an initial temperature T is placed with 2.00 kg of ice that is initially at – 20.0oC. The ice is in an insulated container of negligible mass and no heat is exchanged with the surroundings. After thermal equilibrium is reached, there is 1.20 kg of ice and 0.80 kg of liquid water. What was the initial temperature of the piece of copper?

A glass flask whose volume is 1000.00 cm3 at 0.0oC is completely filled with mercury at this temperature. When flask and mercury are warmed to 55.0oC, 8.95 cm3of mercury overflow. If the coefficient of volume expansion of mercury is 18.0 X 10-5 K-1 compute the coefficient of volume expansion of the glass.

1. Calculate the force of gravity on a 1.2x105 kg space station at a distance of 3.5x105 m from Earth’s surface.

a capacitor that has air between its plates is connected across a potential differences of 12.0 v and stores 48.0 mu c. what is the capacitance of capacitor?

A 6.5 m ladder leans against a wall, making an angle of 60o with the ground. If the foot of the ladder is

push 75 cm closer to the wall in Figure 1, how far will the ladder slide up the wall?

 coil of wire 4 m long has a resistance of 20 2. If its resistivity is 108 x 10*2 m, find its

area of cross-section

A modern digital barometer says that atmospheric pressure is 101.293 kPa and the height of mercury in the barometer is 762.79 mm as shown. What is the absolute pressure of the gas in the bulb of this barometer (in Pa)? [The density of mercury at this temperature is 13534 kg m−3 . In this problem use g = 9.807 m s−2 .]

A brick is dropped from 100 m up. Find its impact velocity and air time