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A 56-kg person on skis starts from rest down a hill sloped at 37° from the horizontal. The coefficient of friction between the skis and the snow is 0.12. After the skier had been moving for 5.0
A 0.57 kg object is attached to a spring with a spring constant 176 N/m so that the object is allowed to move on a horizontal frictionless surface. The object is released from rest when the spring
A lighthouse that rises h1 = 48.6 ft above the surface of the water sits on a rocky cliff that extends $d$ = 20.4 ft from its base, as shown in the figure below. A sailor on the deck of a ship sigh
A camel sets out to cross the desert, which is 37.5 km wide in the north-south direction. The camel walks at the uniform speed 4.26 km/hr along a straight line in the direction 39.8? north of East
Use dimensional analysis to derive an estimate of the mass density, p, of a spiral galaxy disk, in terms of its scale height hz, its vertical velocity dispersion z, and a relevant physical cons
What must the charge (sign and magnitude) of a particle of mass 1.41 be for it to remain stationary when placed in a downward-directed electric field of magnitude 620 ?
A 0.429 kg ice puck, moving east with a speed of 2.91 m/s, has a head-on collision with a 0.846 kg puck initially at rest. Assuming a perfectly elastic collision, what will be the speed and directi
How many extra electrons are on this particular oil drop (given the presently known charge of the electron)?
A platform is rotating with an angular speed of 3.00 rad/s and an angular acceleration of 11.0 rad/s2. At a point on the platform that is 1.30 m from the axis of rotation, what is the magnitude of
A 65 kg human sprinter can accelerate from rest to 10 m/s in 2.9 s. During the same interval, a 33 kg greyhound can accelerate from rest to 20 m/s. Compute (a) the change in kinetic energy and (b)
Students are having a water balloon fight in the hallway. The ceiling is of height 3.4m, and the balloons are launched at a velocity of 11 m/s. The acceleration of gravity is 9.8 m/s^2. At what ang
Determine the normal force for a laundry basket with a mass of 4.8 kg in each of the following situations (a) at rest on a horizontal surface (b) at rest on a ramp inclined at 12 above the horizonta
A charge of 3.45 µC is held fixed at the origin. A second charge of 3.45 µC is released from rest at the position (1.15 m, 0.350 m). If the mass of the second charge is 2.90 g, what is
Water pressurized to 3 x10^5 Pa is flowing at 5.0 m/s in a pipe which contracts to 1/3 of its former area. What are the pressure and speed of the water after the contraction?
Its reservoir sits 146 above its generating station and holds 9.0×109 of water. The power plant generates 316 of electric power while draining the reservoir over an 7.6 period. Its efficiency
As long as the airplane's receiver is silent, the pilot knows she's directly in line with the runway. If she drifts to one side or the other, the radio will pick up a signal and sound a warning bee
The net force on a boat causes it to accelerate at 1.55 m/s^2. The mass of the boat is 215 kg. The same net force causes another boat to accelerate at 0.125 m/s^2.
A car travels due east with a speed of 38.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle
A floodlight with a mass of 46.0 kg is used to illuminate the parking lot in front of a library. The floodlight is supported at the end of a horizontal beam that is hinged to a vertical pole. A cabl
Charges of +6.0x10^-7C each are located at three of the corners of a square that is 1.0m on each side. A charge of -1.3x10^-6C is located at the other corner. What is the electric field at the cent
If the backpack begins to slide when the spring ( = 160 ) stretches by 2.40 , what is the coefficient of static friction between the backpack and the table?
How much time does it take for the package to reach the ground? [Hint: v_0 for the package equals the speed of the helicopter.]
When the tire surface is rotating at a maximum speed of 12 m/s, the stone flies out of the tread. The magnitude FN of the normal force that each side of the tread channel exerts on the stone is 1.8
A string of 13 identical Christmas tree lights are connected in series to a 127 V source. The string dissipates 63 W. What is the equivalent resistance of light string?
An astronaut of mass 76.0 kg is taking a space walk to work on the International Space Station. Because of a malfunction with the booster rockets on his spacesuit, he finds himself drifting away fr