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Many traffic lights change when a car rolls up to the intersection. How does the light sense the presence of the car?
Three identical masses of 410 each are placed on the x axis. One mass is at = -11.0 , one is at the origin, and one is at = 33.0 . What is the magnitude of the net gravitational force on the mass at
Current causes the temperature of a real resistor to increase why? What effect does this heating have on the resistance? Explain
Bonnie and Clyde are sliding a 287 kg bank safe across the floor to their getaway car. The safe slides with a constant speed if Clyde pushes from behind with 385 N of force while Bonnie pulls forwa
A proton moves with a speed of 2.4 106 m/s horizontally, at a right angle to a magnetic field. What magnetic field strength is required to just balance the weight of the proton and keep it moving ho
A group of swimmers is resting in the sun on an off-shore raft. They estimate that 2.8 m separate a trough and an adjacent crest of surface waves on the lake. They count 13 crests that pass by the r
A diving board of length 3.00 is supported at a point 1.00 from the end, and a diver weighing 540 stands at the free end. The diving board is of uniform cross section and weighs 265. What is the mag
A surface is infinitesimally close to and surrounds a dipole. The electric flux through the surface must be zero, since the net charge it surrounds is zero. How is it possible for the dipole to hav
a source produces sound waves of time period .001 second and wave length of 20cm. calculate the time taken by sound waves to travel a distance of 800 metres.
A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials' boat pulls up next to the spy's boat, both reach the edge of a 5.1 m waterfall.
If the collision is perfectly inelastic, calculate the speed and direction of the players just after the tackle.
At the starting gun, a runner accelerates at 0.9 m/s2 for 4.1 s. The runner's acceleration is zero for the rest of the race.
A hotel elevator ascends 130 m with a maximum speed of 5.8 m/s. Its acceleration and deceleration both have a magnitude of 1.5 m/s2.
27 g of copper pellets are removed from a 300 degree Celsius oven and immediately dropped into 110 mL of water at 25 degree Celsius in an insulated cup. What will the new water temperature be?
A proton moves at 4.5×10^6 m/s horizontally at a right angle to a magnetic field. What is the strength of the magnetic field required to exactly balance the weight of the proton and keep it mo
A commuter train travels between two downtown stations. Because the stations are only 1.38 km apart, the train never reaches its maximum possible cruising speed.
Bonnie and Clyde are sliding a 315 bank safe across the floor to their getaway car. The safe slides with a constant speed if Clyde pushes from behind with 379 of force while Bonnie pulls forward on
A train moving with constant velocity travels 180 north in 14 and an undetermined distance to the west. The speed of the train is 35. Find the direction of the train's motion relative to north.
A canoeist paddles upstream at 2m/s and then turns around and floats downstream at 4m/s. The turn-around time is 8s. a: What is the average velocity of the canoe?
A small object with a mass of 330 mg carries a charge of 30.0 nC and is suspended by a thread between the vertical plates of a parallel-plate capacitor. The plates are separated by 2.00 cm. If the
Two joggers run at a constant velocity of 7.5 m/s toward the east. At time t=0, one is 15m east of the origin and te other is 15m west. a: what would be the differences in the position-time graphs o
A golf ball is struck with a five iron on level ground. It lands 92.4 away 4.20 later. What was (a) the direction and (b) the magnitude of the initial velocity
Assume that the soil has an average water content of 2.5 kg/kg and a bulk density of 1500 kg/m3. Estimate the approximate position of both peaks 30 years after they were spilled. Estimate the expect
To determine if the ball clears the cross- bar, what is its height with respect to the crossbar when it reaches the plane of the crossbar?
A student who weighs 470 N is wearing a backpack that weighs 88 N. The student is standing still on level ground. What is the magnitude of the net force on the student?