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As a safety precaution when working with lasers, scientists wear red-colored glasses that will block all colors but red. Why is red light safer than blue light? Why is a red laser safer than a blue laser?
Your eye (diameter 2.5 cm) is able to focus the image of a tree on your retina. The tree is 24 m tall and 85 m away. What is the size of the image of the tree on your retina
a heat engine absorbs 120 j of heat from the hot reservoir and releases 60 j of heat to the cold reservoir during each
The block of mass M slides back along the horizontal surface with a coefficient of kinetic friction mk and eventually comes to a rest. In terms of v4, how far does the block slide during this final leg of its journey
You are driving your car and the traffic light ahead turns red. You apply the brakes for 2.5s and the velocity decreases to +4.62 m/s. What is the cars deplacement
A 50g marble moving at 2.2m/s strikes a 30g marble at rest. Assume the collision is perfectly elastic and the marbles collide head-on. A.What is the speed of the first marble immediately after the collision? B.What is the speed of the second marbl..
A ball is thrown straight up in the presence of gravity and quadratic air resistance (frictional force = -cv^2v~). Find the velocity as a function of height
A roller coaster car crosses the top of a circular loop-the-loop attwice the critical speed. What is the ratio of the normal force to the gravitational force?
The switch in given Figure has been in position A for a long time and is moved to position B at t = 0.- The switch suddenly returns to position A after 10 ms. Find vC(t) fort ≥ 0 and sketch its waveform.
Fish are hung on a spring scale to determine their mass (most fishermen feel no obligation to report the mass truthfully). How far apart are the half-kilogram marks on the scale
the mass of platinum is 21.4 x 103 kgm3. a platinum wire with a radius of 0.500mm 1.20 m long fixed at both ends has a
A city bus begins from rest at one bus stop. It accelerates at 0.5 m/s2 for 25 s, What is the distance between the two bus stops
A playground merry-go-round of radius R = 2.00 m has a moment of inertia I = 245 kg m2 and is rotating at 9.0 rev/min about a frictionless vertical axle. Facing the axle, a 27.0 kg child hops onto the merry-go-round and manages to sit down on its edg..
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