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Q. A sledge loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope inclined at 20.1° above the horizontal. The sledge moves a distance of 20.3 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.500.
What is the mechanical energy lost due to friction?
Q. When a guitar string is sounded along with a 441-Hz tuning fork, a beat frequency of 4.00 Hz is heard. When the same string is sounded along with a 437-Hz tuning fork, the beat frequency is 8.00 Hz. What is the frequency of the string?
Four charges are placed at the vertices of a square, centered at the origin. If each side of the square has a length of 0.224 m, what is the strength and direction of net electric field at the origin? Express your answer in terms of the charge ma..
Two 5000 kg passenger cars roll without friction (one at 1 m/s, the other at 2 m/s) toward one another on a level track. They collide, couple, and roll away together with the combined momentum.
A skier moving at 4.50 m/s encounters a long, rough horizontal patch of snow having coefficient of kinetic friction 0.230 with her skis. How far does she travel on this patch before stopping.
A horizontal force of 213 N is exerted on a 1.90 kg discus as it rotates uniformly in a horizontal circle (at arm's length) of radius 1.60 m. determine the time for one revolution of the discus. Round the answer to 2 decimal places.
A kayaker needs to paddle north across an 85 m wide harbor. The tide is going out, creating a tidal current that flows to the east at 1.7 m/s. The kayaker can paddle with the speed of 3.0 m/s.
suppose the apparatus as used in this lab: A cube of mass M = 500 g and side length 30 mm is free to spin on an axis through the center of one face. A massless pulley on this axis has a diameter of 2r = 10 mm. An object with m = 50 g is hung from ..
A car goes round a flat curve at a speed of 32 ms-1. If the radius of the curve is 200 m, find the minimum value for the coefficient of friction so that the car can go around the curve without skidding.
A 200 g block is pressed against a spring of force constant 1.40 kN/m until the block compresses the spring 10 cm. The spring rests at the bottom of a ramp inclined at 60.0 degrees to the horizontal.
Two boats start together and race across a 62-km-wide lake and back. Boat A goes across at 62 km/h and returns at 62 km/h. Boat B goes across at 31 km/h, and its crew, realizing how far behind it is getting, returns at 93 km/h.
The gravitational force between two masses M and m separated by a distance r is 40 N. What is the new force when this distance is halved?
Find out the magnitude of the friction force acting on the case. Laser light with a wavelength = 680 illuminates a pair of slits at normal incidence. What slit separation would produce first-order maxima at angles of 40 from the incident direction.
A ship sets out to sail to the point 158 km due north. An unexpected storm blows the ship to a point 134 km due east of its starting point. (a) How far (in km) and (b) in what direction (as an angle from due east, where north of east is a positive an..
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