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Two boats start together and race across a 40-km-wide lake and back. Boat A goes across at 40 km/h and returns at 40 km/h. Boat B goes across at 20 km/h, and its crew, realizing how far behind it i
It is then pulled down 6.80 and released. What is the time constant if the ball's amplitude has decreased to 3.90 after 57.0 oscillations?
Drawing on Erastothenes' method, if two observers are due north and south of each other and are separated by 400 km, what is the circumference of their spherical world if they see the same star on
A projectile is fired horizontally from a gun that is 45.0 m above flat ground, emerging from the gun with a speed of 250 m/s. (a) How long does the projectile remain in the air? (b) At what horizo
The coefficient of kinetic friction between each brake pad and the rim is μk = 0.85. What is the magnitude of the normal force that each brake pad applies to the rim?
A grocery cart with mass of 18 kg is pushed at a constant speed along an aisle by a force F = 12 N. the applied force acts at a 20 degree angle to the horizontal. find the work done by each of the
Three charges are arranged in a square (along with point P) with sides equal to 12.5cm as in figure below. Calculate the electric field (magnitude and direction) at point P due to the three charges.
He throws the ball in your direction, and it floats toward you at a lazy 20 {rm m/s}. What is the speed of the truck?
If S2 moves with a speed of 0.7c with respect to a rest frame S1, find the length of the meterstick as measured in frame S1 according to classical physics.
Two charged pith balls are suspended on very light 10.5 cm strings. Each has a mass 11.0g. In equilibrium, the total angle between the strings is 35 degrees. Draw a free body diagram for one of the
A curve of radius 60 m is banked for a design speed of 100 km/h. If the coefficient of static friction is 0.30 (wet pavement), at what range of speeds can a car safely make the curve?
A block with a mass of 10g is pulled at a constant speed across a horizontal tabletop with a spring scale. the scale reads 65.3N. calculate the coefficient of kinetic friction.
The distance between two consecutive nodes of a standing wave is 24.2 cm. The hand generating the pulses moves up and down through a complete cycle 2.84 times every 8.38 s. Find the velocity of the
Two trains, each having a speed of 35 km/h, are headed at each other on the same straight track. A bird that can fly 60 km/h flies off the front of one train when they are 68 km apart and heads dir
By varying the angle, however, you should have seen some small differences in your period, especially for 60°. How can you explain this apparent variation of the period with angle?
Two horizontal forces, 240 N and 156 N, are exerted on a canoe. If the these forces are applied in the same directions, find the net horizontal force on the crate.
A charge moves a distance of 2.3 cm in the direction of a uniform electric field having a magnitude of 239 N/C. The electrical potential energy of the charge decreases by 72.3544 × 10-19 J as
Determine the tangential component of the linear acceleration of a point on the edge of the wheel 2.0 after it has started accelerating.
A 0.50 kg ball that is tied to the end of a 2.0 m light cord is revolved in a horizontal plane with the cord making a 30° angle, with the vertical. If the cord can withstand a maximum tension o
Determine the coordinates of the loaded ferryboat relative to the center of the raft. Take the origin to be at the of the raft.
A coil can be considered to be a resistance of 120 ohms and an inductance of 0.5 H in series. The coil is connected across a 180 V rms, 75 Hz line. Find the power.
A transformer operating from 61 V (rms supplies a 16.1 V lighting system for a garden. Eight lights, each rated 62 W, are installed parallel. Find the equivalent resistance of the system.
A swimming pool has dimensions 28.0 m 7.0 m and a flat bottom. The pool is filled to a depth of 1.90 m with fresh water. What is the force exerted by the water on the bottom?
A length of organ pipe is closed at one end. If the speed of sound is 344 m/s, what length of pipe is needed to obtain a fundamental frequency of 68 Hz?
How fast (in rpm) must a centrifuge rotate if a particle 8.06 cm from the axis of rotation is to experience an acceleration of 79000 g?