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A 2.30 x 102-N force is pulling an 75.0-kg refrigerator across a horizontal surface. The force acts at an angle of 23.0° above the surface. The coefficient of kinetic friction is 0.200, and the
The cheetah is one of the fastest-accelerating animals, because it can go from rest to 12.8 m/s (about 29 mi/h) in 1.9 s. If its mass is 101 kg, determine the average power developed by the cheetah
A 0.19-kg apple falls from a branch 3.5 m above the ground. a) Does the power delivered to the apple by gravity increase, decrease, or stay the same during the time the apple falls to the ground? Ex
Determine the electric flux through the plane surface, which is represented by the normal vector (or area-vector) A=(+1,-2,+2)m^2 . (Remember, a normal vector is perpendicular to a given surface and
If the electric field in a region of space is zero, can you conclude there is no net electric charge in that region? Can you conclude that there are no charges at all in the region? Explain.
An insulating sphere is 20 cm in diameter, and carries a +4.2 µC charge uniformly distributed throughout its interior volume. Calculate the charge enclosed by a concentric spherical surface wi
An infinitely long wire carries a uniform charge λ per unit length. In this example let's assume that (three micro-Coulombs per meter, that is, a one-meter section of this wire carries 3μ
Find the potential V of a uniformly charged disk of radius b with a hole in it of radius a at a point P that lies a distance x along the center axis of the disk. Then, using V, find the E-field at t
(a) Calculate the magnitude of the magnetic dipole moment of the loop in amperes-square meters. (b) What is the magnitude of the torque acting on the loop?
The bob is held to the side with the string horizontal. Then the bob is released from rest. At the lowest point of the swing, the string catches on a thin peg a distance R above the lowest point. Sh
At a later time t = 2.00 s, the particle is located at x = 8.50 m and y = 5.00 m. What constant force acted on the object during this time interval?
A 15-g bullet is fired from a rifle. it takes 2.50 * 10 to the negative 3 power for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 715 m/s. assuming that the
It takes 140 J of work to move 2.6 C of charge from a positive plate to a negative plate. What voltage difference exists between the plates? Answer in units of V.
What is the magnitude of the vertical displacement delta y of the electron while it is in the electric field? Answer in units of m.
If the magnetic field has a magnitude of 363 µT and is in the positive x direction, find the (a)x, (b)y, and (c)z components of the electric field. Give your answers in V/m
A cart mass of 28 kg is moving 26 km/hr to the right on a track. It collides with a cart of mass of 15 kg. The final velocity of carts that become stuck together after the collision is 5 km/hr to th
For safety considerations, the roller coaster's speed at the top of the loop must be such that the force of the seat on a rider is equal in magnitude to the rider's weight. From what height above th
The passengers in a roller coaster car feel 50% heavier than their true weight as the car goes through a dip with a 20 m radius of curvature. What is the car's speed at the bottom of the dip?
A particle of mass 46 g and charge 69 muC is released from rest when it is 52 cm form a second particle of charge -20 muC. Determine the magnitude of the initial acceleration of the 46 g particle. Ans
Unfortunately, the motorcycle engine dies just as he starts up the ramp. He is going 11 at that instant, and the rolling friction of his rubber tires is not negligible.
The object slides down the ramp and into the spring, compressing it a distance x before coming momentarily to rest. (a) Find x. (b) What happens to the object after it comes to rest?
A 3.00-kg block is connected to two ideal horizontal springs having force constants = 27.0(left)N/cm and = 20.0(right)N/cm (the figure ). The system is initially in equilibrium on a horizontal, fric
It is approaching the Earth on a head-on course with a velocity of 710 {m/s} relative to the Earth and is now 4.5×10^6 {km} away. With what speed will it hit the Earth's surface, neglecting fr
A child Standing on a playground merry-go-round is moving with a velocity of 1.36 m/s. When she is 1.20 m from the center of the merry-go-round, there is a centripetal force of 38.53 N acting on he
An astronaunt of mass 55.4 kg is on a space walk to repair a communications satellite. Suddenly he needs to consult his book so you throw it to him with speed 8.5 m/s relative to your spacecraft. He