Physics Answers

Way to minimize the evaporation in a Beaker of hot water

what is the magnetic force FB acting on the particle due to the field?

Two circular loops A and B have their planes parallel to each other. Loop A has a current moving in the counterclockwise direction when viewed from above.

a. If the current in loop A decreases with time, what is the direction of the current in loop B? will the two loops attract or repel each other?

b. If the current in Loop A increases with time, what will be the direction of the current in Loop B? Will the two loops attract or repel each other?

An insulating sphere of radius 8.0 cm carries a uniform volume charge density

of 500 nC/m^3. What is the electric field in N/C at r = 3.0 cm?

Find the volume occupied by 2 moles of a gas at STP.

When you walk your foot pushes backwards on the ground. The force of your foot on the ground is part of an action-reaction pair. What is the other force in the pair?

It took a man 3 seconds nto raise a load of 40kg to a hight of 25 m.Determine the average power employed.

A body of 85kg moving with velocity of 9ms-¹ hits a stationary body of mass 60kg. If the two bodirs stick together after collision, calculate the magnitude of the velocity with whicj they move.

Rocket taxis of the future move about the solar system at half the speed of light. Drivers receive $100.00 per hour as measured by clocks in the taxis. The taxi drivers’ association demands that the pay be based on earth time instead of the taxi time. If their demand is met, by what fraction will their wages change? Would this be beneficial for them or not?

Supposed a truck, 10 - m long travels at a speed of 2.5 x 108 m/s relative to two observers, Ana and Marie. Both observers have a can of orange spray paint, which they fire simultaneously when the respective ends of the truck are directly in front of them. When the truck stops, Ana,

Marie and the truck driver look at the orange paint spots. How far apart are these spots? How would the truck driver interpret the same event while in the moving truck?