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You lay a mirror flat on the floor with one edge against a wall and aim a laser at the mirror. Find the angle of incidence of the laser ray on the mirror
Suppose the distance between two objects was doubled and the mass of one of the objects was suddenly cut in a third. How would the gravitational force change
Suppose that a person pushes a box with a constant force of 100 N over a distance of 25 meters. What is the change in kinetic energy
Calculate the kinetic energies of two uniform solid cylinders, each rotating about its central axis. They have the same mass, 2.75 kg
An 80 kg person climbs a set of stairs that are 5 meters high. How much gravitational potential energy does she gain
Suppose a 20 kg ball moving at 5 m/s collides with a 100 kg ball moving at 3 m/s. How much kinetic energy was lost in the collision
A 1120-kg car with an initial velocity of 21.0 m/s eastward crashes into the back of a 3180 kg cargo van, How much kinetic energy is lost from the car-van system
A 4.1×104 locomotive, with steel wheels, is traveling at 7.0 on steel rails when its engine and brakes both fail. How far will the locomotive roll before it comes to a stop
Changes in wind and tide made average speed on return trip 3 mph slower than the speed on the way out. If the total time of the trip took 9 hours find speed of both the going and the return trip.
An astronaut is being tested in a centrifuge. The centrifuge has a radius of 12.0 m and, in starting, rotates according to ? = 0.31t2, what is the astronaut's radial acceleration
The density of a 2.79-m long rod can be described by the linear density function ?(x) = 109 g/m + 10.1x g/m2. Determine the total mass of the rod
A 89.0kg skydiver can be modeled as a rectangular "box" with dimensions 24.0cm \times 44.0cm \times 175cm. What is his terminal speed if he falls feet first
A solenoid 88.0 cm long has a radius of 2.60 cm and a winding of 2000 turns; it carries a current of 3.60 A. Calculate the magnetic field outside the solenoid
A bat strikes a 0.145- baseball. Just before impact, the ball is traveling horizontally to the right at a speed of 40.0 , Find the vertical component of the average force on the ball
Two ice skaters, with masses of 50.0 kg and 85.0 kg, are at the center of a 60.0 m-diameter circular rink. how long does the lighter skater take to reach the edge
A constant force of 46.3 N, directed at 28.7o from horizontal, pulls a mass of 14.7 kg horizontally a distance of 3.09 m
A solar cell generates a potential difference of 0.95 V when a 380 ? external resistance is connected across it, What is the internal resistance of the solar cell
A helicopter has blades of length 6 m, rotating at 4.1 rev/s about a central hub. If the vertical component of Earth's magnetic field is 4.5×10?5 T, FIND the maximum emf induced in the coil by
A magnetic ?eld of 0.285 T exists in the region enclosed by a solenoid that has 329 turns and a diameter of 11.5 cm. What current is induced in the coil
A horizontal spring with k = 72N/m has one end attached to a wall and the other end free. find maximum spring compression
When two carts having the same mass and the same speed collide and bounce off of each other elastically, what is the final total momentum of the carts
a thin glass (n = 1.50) converging lens for which the radii of curvature are R1 = 15.0 cm and R2 = -12.0 cm. Determine the area of the image
A 28.0-N block rests on a horizontal surface. The coefficients of static and kinetic friction between the surface, What is the force of friction acting on the block
A certain dog whistle operates at 22.75 kHz, while another (brand X) operates at an unknown frequency. estimate the operating frequency of brand X
A 2260 kg satellite used in a cellular telephone network is in a circular orbit at a height of 710 km above the surface of the earth. What is the gravitational force on the satellite