Physics Answers

1. An object fall freely from rest. Find the following:
a. Velocity of the object after falling 100 meters
b. Time required to reach a velocity of 30 m/s
c. Time it takes for an object to fall 500 meters


2. A pitcher tosses a ball up along vertical, with an initial speed of 12 m/s. How long does the ball to reach the maximum height? What is the maximum height attain by the ball from the release point?

3. A stone falls from a railroad overpass which is 36 feet high into the path of a train which is approaching the overpass with uniform speed. If the stone falls when the train is 30 feet away from the overpass and the stone hits the ground just as the train arrives at that spot. How fast is the train moving?

4. How high will a body rise that is projected vertically upward with a speed of 100 ft/s. How long will it take to reach the maximum height?

A single layer of No. 24 AWG (dia=0.0201 in) commercial iron wire is wound over a ceramic tube whose diameter is 3.25 in. if the total wire resistance is 41 ohms, determine the number of turns.

An electron is released from rest in a uniform electric field. The electron accelerates
vertically upward, travelling 4.50 m in the first 3.00 micro second after it is released. What
are the magnitude and direction of the electric field? [Note: Neglect the gravitational force]

1. A coil of annealed copper wire has 820 turns, the average length of which is 9 in. If the diameter of the wire is 32 mils, calculate the total resistance of the coil at 200C.

a train starting from a railway station and moving with uniform acceleration attains a speed of 40km/h in 10 minutes find its aaceleration

A circular loop of radius R = 15 cm is centered at the origin in the region of a uniform, constant electric field. When the normal to the loop points in the positive x-direction the flux through the loop is Φ1 = 65 N•m2/C. When the normal to the loop points in the positive y-direction the flux through the loop is Φ2 = -55 N•m2/C. When the normal to the loop points in the positive z-direction the flux though the loop is zero.

(a) Calculate the x-component of the electric field, in newtons per coulomb.

(b) Calculate the y-component of the electric field, in newtons per coulomb.

(c) Calculate z-component of the electric field, in newtons per coulomb.

(d) Calculate the magnitude of the electric field, in newtons per coulomb.

(e) Use both Ex and Ey to calculate the angle θ in degrees that the electric field makes with the positive x-axis in the x-y plane.

A uniform electric field of magnitude E = 12 N/C points along the x-axis. A circular loop of radius R = 25 cm is centered at the origin with the normal to the loop pointing θ = 15 degrees above the x-axis.

(a) Calculate the electric flux in units of Nm2/C that passes through the loop.

(b) To what angle in degrees relative to the x-axis should the normal of the loop be rotated so that the flux through the loop becomes Φ' = 0.31 Nm2/C?

Every year the Earth travels about 1x10*9 km as it orbits the Sun. What is Earth’s average speed in km/h?

A runner starts from rest and accelerates uniformly to a speed of 8.0 meters per second in 4.0 seconds. What is the magnitude of the acceleration of the runner?