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Q. An oil drop carries one excess electron and weighs 9.3 x10-15 N. What electric field strength is required to suspend the drop so it is motionless?
Q. A 0.25 kg stone attached to a 0.8 m long string is rotated in a horizontal plane. The string makes an angle of 24° with the horizontal. Determine the speed of the stone.
What are the velocities of the two people after the snowball is exchanged. What is the greatest kinetic energy of the electrons removed from the cathode by this light.
A 246 kg wooden raft floats on a lake. When a 80kg man stands on the raft, it sinks 4cm deeper into the water. When he steps off, the raft vibrates for a while.
A box of mass 32 kg is at rest on a horizontal frictionless surface. A constant horizontal force then acts on the box, and accelerates it to the right. It is observed that it takes the box 6.5 seconds to travel 48 meters. What is the magnitude of for..
As part of a safety investigation, two 1700kg cars travelling at 25 m/s are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.3 seconds to stop, and (b) car that hits a concrete ..
Two objects with masses 5.60 kg and 1.40 kg hang 0.500 m above the floor from the ends of a cord 6.80m long passing over a frictionless pulley. Both objects start from rest. Find the maximum height reached by the 1.40kg object.
How far above the aim is the point
A uniform magnetic field of magnitude B= 1.2 teslas is directed toward the bottom of the page in the -y direction as shown above. At time t=0, a proton p in field is moving in the plane of the page with a speed v0= 4 x 10^7 meters per second in a ..
What is an actual mechanical advantage of the system
What is the direction of proton after the collision? What is the direction of carbon atom after the collision.
A 1125 kg car and a 2250-kg pickup truck approach a curve on the express way that has a radius of 225 m. (a) At what angle should the highway engineer bank this curve so that vehicles traveling at 95 km/h can safely round it? (b) As car and truck ..
Is kinetic energy consumed in the third type of collision studies? Classify the three collision kinds as elastic, inelastic, or completely inelastic.
An anchor holding a boat stationary on a river forms a 65 degree angle with the river bottom. The anchor line is 40 meters long. Assume the river has a uniform depth, how deep is the river directly below boat.
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