Physics Answers

Velocity of 54m/s acceleration uniformly at rate of 2ms velocity reaches 72m/s

Calculate the distance travelled from the place where the acceleration began

The time taken to cover this distance

If you have ever been down a water-slide (a flume) you will know that you tend to slide up the side as you go around a bend. Explain how this provides the centripetal force needed to push you around the bend. Explain why you slide higher if you are going faster.

A wet socks clinging to the inside of a washing machine drum which is spinning at a speed of

4.7 m/s. The radius of the drum is 30 cm.

(a) (Marks: 2) What is the minimum coefficient of static friction

between sock and the drum so that the sock will not slip down?

(b) (Marks: 1) At the same rotational speed and coefficient of

static friction between sock and the drum, would a sock of twice

the mass slide down the wall? Explain your answer.

(c) (Marks: 2) As the drum slows down after the washing is done

at an angular retardation of 3.25 rad/sec2

. Find the time taken and

number of rotations before it stops.

The position of a point is given as a function of time by x= 4t − 6t + 2t− 1 , where x and t are expressed in meters and seconds. Determine the position, the velocity, and the acceleration of the particle when t= 2 s.

The acceleration of a point is a= 20t m/s2. When t= 0, x= 40 m and v= - 10 m/s. What are the position and velocity at t= 3 s?

a particle is moving along a straight line with the acceleration a= (15 t− 7t/3) ft/s2, where t? is in seconds. determine the velocity and the position of the particle as a function of time when t= 0, v= 0 and x= 15 ft.

Point charges 88μC,-55μC and 70 μC are placed in a straight line. The central one is 0.75m from each of the others. Calculate the net force on each due to the other two.

If the sound intensity 4.0 m from a point sound source is 1.0 × 10⁶ Wm², what will be the sound intensity at each of the following distances from the source:

A. 1.0 m? And

B. 2.0 m?

The spring oscillates to the other end. The amplitude is 3.5m, k = 1.2, and = 4.3 . Solve the frequency, wavelength, wave speed, period, wave number, and direction.

A simple pendulum takes 23.5 seconds to complete 20 cycles. What is the perion and frequency of the pendulum?