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A laser (wavelength 600nm) passes through a 2.44mm circularapertue and hits a screen 1km away. What is the diameter of the spot on the screen?
a mass-spring system oscillates on a horizontal frictionless surface with an amplitude of 3.24 cm.a if the spring
A playground is on the flat roof of a city school, 5 m above the street below (see figure). The vertical wall of the building is h = 6.20m high, to form a 1.20 m high railing around the playground.
A solid spherical ball of mass 1.27 kg and radius 0.12 m rolls along a smooth, level surface with a speed of 2 m/s. How far up the plane does the ball go
A student on a piano stool rotates freely with an angular speed of 3.10 rev/s. The student holds a 1.40-kg mass in each outstretched arm, 0.759 m from the axis of rotation, Calculate the initial and final kinetic energy of the system
A piece of plastic has a net charge of +2.00 uC. How many moreprotons than electrons does this piece of plastic have?
A rocket fires two engines simultaneously. One produces a thrust of 760N directly forward while the other gives a thrust of 517N at an angle 39.6 above the forward direction
If John Glenn weighed 640N on Earth's surface, i) how much would he have weighed if his Mercury spacecraft had (hypothetically) remained at twice distance from the center of the Earth? ii) Why is it said that an astronaut is never truly weightless..
A father pulls his son, whose mass is 22.9 kg and who is sitting on a swing with ropes of length 3.21 m, What is the speed of the son at the bottom of the swinging motion
a wheel of diameter 144 cm has an axle of diamter 15 cm. a force of 150N is exerted along the rim of the wheel. What force should be applied to the outside of the axle
A 50,000 locomotive, with steel wheels, is traveling at 7.0 on steel rails, How far will the locomotive roll before it comes to a stop
A student decides to move the box of books into her dormitory room by pulling on a rope attached to the box. She pulls with a force of 168 N at an angle of 30.0° above the horizontal. The box has a mass of 21.0 kg, and the coefficient of kinetic f..
question1attempting to stop on a slippery road a car moving at 85 skids across a road at a 30 angle to its initial
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