Physics Answers

A balloon is rising vertically upward with a uniform

velocity 'u' as shown in Fig. 11.E22. At a certain

instant, a ball No. 1 is dropped from it, which takes a

4 sec to reach the ground. The moment this ball

strikes the ground, another ball is dropped from the

balloon and this 2nd ball takes 5 sec to reach the

ground. Find the velocity of the balloon 'u' and height

from which both the balls must have been dropped.

a conducting cylinder of radius 3.25 cm and length 5.6 cm has a total charge of 4.5 x 10 c distributed uniformly on its surface area. find the potential at a) its surface, and b) 2.5 cm and c) 5.0 cm from the center of the cylinder.

A turtle crawls along a straight line, which we will call the x-axis with the

positive direction to the right. The equation for the turtle’s position as a function of time is x(t) = 51.0 cm +

(2.50 cms) t − (0.0623 cms2) t2

a.)At what time t is the velocity of the turtle zero?

(b) How long after starting does it take the turtle to return to its starting point?

(c) At what times t is the turtle a distance of 0.1 m from its starting point? What is the velocity (magnitude and direction) of the turtle at each of these times?

10m of rope has a mass of 2.0kg. When the speed of transverse waves along the rope is 6.0ms^-1 the tension in N is?

(a) 1.2 (b) 7.2 (c) 72.0) (d) 28.8 (e) 2880 answers

A 100 kg block is pulled at a constant speed of 5 m/s across a horizontal force by an applied force of 122 N directed 37 ^o above the horizontal. The rate at which the force does work on the block is.

Find the average horsepower, P =? required to raise a 150 kg drum to a height of 20 m in a time of 1 minute. SOLUTION: P = wk/t = mgH/t

You push against the rock with a force of F = 100N for t = 20 seconds. If the rock does not move d = 0, how much work have you done, Wk?

SOLUTION: Wk = F d cos 0

A car is proceeding down a 1 in 10 incline at 65kph when it’s brakes are abruptly applied. How far does it skid along the road before stopping is the wheels lock and the coefficient of friction between the tires and the road is 0.7?

A 60g bullet is fired at a target that presents an average resistive force to the passage of the bullet of 20kN per metre thickness of the material from which is constructed. If the bullet strikes the target at 600ms^-1, what does the minimum thickness of the target have to be to stop the passage of the bullet completely?

Calculate the capacitance of a capacitor with separation distance of 800m with an area 1.25kmsquare.The permittivity of free space is 8.892*10^-13