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Two children push on opposite sides of a door during play. Both push horizontally and perpendicular to the door. One child pushes with a force of 175 N at a distance of 0.400 m from the hinges, and the second pushes at a distance of 0.450 m. What force must the second exert to keep the door from moving? Assume friction is negligible.
describe the enery transformations that take place as you swing on a swing.why do you have to keep pumping to keep swinging as high? what happens if you stop pumping
A 3 GHz line-of-sight microwave communication link consists of two lossless parabolic dish antennas, each 1 m in diameter.
The equations for free fall at the surface of Mars and Jupiter (s in meters, t in seconds) are Mars, s = 1.86t^2; Jupiter, s = 11.44t^2. How long would it take an object falling from rest to reach a velocity of 100 km/hr on each planet?
A straight wire of mass 200 g and length 1.5 m carries a current of 2 A. What is the magnitude of the magnetic field
a car is initially moving at 60 ms and must stop in 100 m. what minimum constant acceleration must the car
An electron with speed v0 = 1.6 multiplied by 106m/s is traveling parallel to an electric field of magnitudeE = 7.7 multiplied by 103 N/C. How far will the electron travel before it stops
A bowling ball encounters a 0.760-m vertical rise on the way back to the ball rack, as the drawing illustrates. Find the translational speed at the top
In a photoelectric effect experiment, which metal will have a higher cutoff wavelength (i.e. the wavelength above which no electrons are emitted), silver which has a work function of 4.73 eV or lead which has a work function of 4.14 eV? Explain why.
A 20 N crate is held at rest on an incline by a rope that is parallel to the incline as shown on the figure to the right. The incline is 30 degree above the horizontal. The coefficient of static friction between crete and incline is .35
A log-raft was made by lashing some logs together, where each log has a diameter 0.45 m and length 3.80 m. How many logs should be there in the raft to have 10 men safely afloat on the raft in sea water
It takes 180J of work to compress a certain spring 0.15m. What is the force constant of the spring
A novice skier, starting from rest, slides down a frictionless 33.0° incline whose vertical height is 124 m. Explain how fast is she going when she reaches the bottom?
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