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Question1
A photographer in a helicopter ascending vertically at a constant rate of 12.5 m/s accidentally drops a camera out the window while the helicopter is 60.0 m above the ground.
(a) How long will it take the camera to reach ground?
(b) What will its speed be when it hits?
Question2
A 4.130 kg block of wood rests on a steel desk. The coefficient of static friction between the block and the desk is μs = 0.455 and coefficient of kinetic friction is μk = 0.305. At time t = 0, a force F = 11.3 N is applied horizontally to the block. Status the force of friction applied to the block by the table at the follow times-t=0 and t>0
Question3
The Earth's magnetic field has strength of about 0.5 gauss. What magnetic field strength has to be produced by the Helmholtz coils so that the Earth's magnetic field has less than a 1 percent effect on this experiment?
Analyse the instantaneous velocity of the car
A 18.0 kg block is dragged over a rough, horizontal surface by a constant force of 77.6 N acting at an angle of 35? above the horizontal. The block is displaced 10.8 m, and the coefficient of kinetic friction is 0.149.
When a rifle is fired, the person firing the rifle absorbs the recoil. Consider an Olympic biathlete firing a competition rifle. What is the magnitude of the force felt by the athlete
A 11.0nC point charge is at the center of a 2.50m× 2.50m × 2.50m cube. find the electric flux through the top surface of the cube
A railroad car of mass 3.0 104 kg moving at 4.00 m/s collides and couples with two coupled railroad cars, What is the speed of the three coupled cars after the collision
A dolphin emits ultrasound at 100 kHz} and uses the timing of reflections to determine the position of objects in the water
the four particles form a square of edge length a = 4.50 cm and have charges q1 = +25.0 nC, q2 = -50.0 nC, What net electric field do the particles produce at the square's center
A race car rounds a curve at 59 m/s. The radius of the curve is 439 m, and the car's mass is 615 kg. (Assume the car's speed remains constant. What is the centripetal force acting on the car
if oxygen molecules are more massive than the nitrogen molecules, is the rms speed of the O2 molecules greater than, less than, or euqls to rms speed of the n2 molecules.
A 66-kg skier starts from rest at the top of a 1200-m-long trail which drops a total of 260m from top to bottom. How much energy is dissipated by friction
Two small insulating spheres with radius 5.50×10?2m are separated by a large center-to-center distance of 0.555m, What is the direction of the electric field at this point
A 67kg man's arm, including the hand, can be modeled as a 70cm -long uniform cylinder with a mass of 3.5kg. by how much does he raise his center of gravity
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