Physics Answers

The speed of a car is decreased uniformly from 30 meters per second to 10 meters per second in 4 seconds. The magnitude of the car's acceleration in m/s^2 is

A force of 230N exist between two identical point charges of 56uC. Calculate the distance of the two point charge.

1. A 10uC point charge is separated by the distance of 28cm from 18uC charge. Calculate the magnitude and electrical force between two charges.

2. The electrical force between two point charges with the magnitude of 300uC and 500uc is 24N. How far apart are two charges?

63. How much work is done by 15 kW engine during 3.5 min?

1) Classify three kinds of statistics, their need, applicability, the idea of phase space, macro-microstates.

Two long, parallel wires are attracted to each other by a force per unit length of 440 𝜇𝑁/𝑚

when they are separated by a vertical distance of 0.80 m. The current in the upper wire is

13.0 A to the right. Determine the location of the line in the plane of the two wires along

which the total magnetic field is zero.

A particle moves

along the X-axis according to the equation (t) = 2.0 - 4.0r m.

What are the velocity and acceleration at t= 2.0 s and t= 5.0 s?

Giant pulses from energetic pulsars have been observed with S5GHz = 10 kJy, but with durations of only 10 ns. The region from where a pulse of radiation originates must be no larger than the distance that light can travel during the duration of a pulse. If the pulsars are at a distance of 1 kpc, estimate the brightness temperature of these sources.

A body of mass 80kg moving with a velocity of 3 meter per second hit a stationary body of mass 40kg.

a. If the bodies move together after impact . Calculate the velocity of the composite body just after impact.

b. If the bodies do not move together and the body of mass 40kg is moving with a velocity of 3 meter per second in the same direction as that of the body of mass 80kg . Find the velocity of the 80kg after impact.

A ball of mass 5.0kg moving with a velocity of 10meter per second collides with a 15.0kg ball moving with a velocity of 4 meterper second. If both balls stick together after collision. Calculate their common velocities after impact if they initially move in

a. same direction

b. Opposite direction