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Two particles A and B are released from rest, having equal charges of -8 x 10
^-6 C and initially separated from each other by 0.025 m. The masses of particles A and B are 6.25 X 10^-6 KG AND 3.75 X 10^-6 kg. Find the magnitude of the initial accelerations of particles A and B.
Sphere A has a charge of +10.0 C. It is brought in contact with a neutral sphere B and then separated. Find the final charges on Spheres A and B if,
a) the sphere have equal radius and
b) if the radius of sphere B is twice the radius of Sphere A
3. A ball is thrown vertically upward with a speed of 30 ft/s from the edge of a cliff 50 ft above sea level with what velocity with it hit the water?
a. 32.2 ft/s b. 58.6 ft/s c. 64.2 ft/s d. 52.3 ft/s
If in the process oof rubbing the lenses of the eyeglasses, 6.28 x 10^10 electrons were transferred,
a) what is the charge of the lenses and the nylon cloth?
b) what is the change in their masses?
Kari uses a two-rope pulley system to lift a box. The box has a mass of 40kg. Kari pulls 8m of rope to lift the box 4m. Kari uses a force of 226.62N to lift the box. Calculate the efficiency of each pulley in the system.
A railway truck of 100kg mass traveling with a velocity of 7ms-1 collides with a second truck of 200kg mass and the two couple automatically and move off together. Calculate the velocity of the coupled trucks and the energy lost to the system; if the second truck has a speed of 5ms-1 (a) in the same direction, (b) in the opposite direction and (c) is initially stationary.
The slope is at an angle of 22° to the horizontal. Each raft has a mass of 8 kg. The length of the slope is 50m.
A child of mass 52 kg sits in a raft at the top of the slope. The raft is released from rest. The child and raft slide together down the slope into the water. The force of friction between the raft and the slope remains constant at 180N.
Show that the acceleration of the child and raft down the slope is 0.67 ms-2
A swinging pendulum has a period of 17.0s when the length is shortened by 1.5m, it's period is 8.55 calculate the original length of the pendulum
On a day that the temperature is 28.0oC, a concrete wall is poured in such a way that the ends of the wall are unable to move. Take Young’s modulus for concrete to be 4.57 x 109 N/m2 and the compressive strength to be 1.32 x 106 N/m2. (a) What is the stress in the cement on a hot day of 43.0oC? (b) Does the concrete fracture? (Take = 1.2 x 10-5 oC-1).
How many electrons have removed from a positively charged particles if it has a net charge of 5X10-9C?
