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Two spheres are cut from a certain uniform rock. One has radius 4.70cm. The mass of the other is seven times greater. Find its radius.
A convex lens of focal length 5 centimeter is used as a magnifying glass. Obtain at what distance from a tiny insect should you hold this lens to get a magnification of +2.9
Light with a wavelength of 338 nm is passed through a diffraction grating with 793 slits/cm. Find the angle at which one would observe the second order maximum
Suppose you throw a 0.069-kg ball with a speed of 18.5 m/s and at an angle of 35.5° above the horizontal from a building 11.5 m high. What will be its kinetic energy when it hits the ground
A very smart three year old child is given a wagon for her birthday. She refuses to use it. "After all," she says, "Newton's third law says that no matter how hard I pull, the wagon will exert an equal but opposite force on me. So I will never be ..
Two lenses, separated by a distance of 22.1 cm, are used in combination. The first lens has a focal length of +26.0 cm; the second has a focal length of -15.0 cm. What is the final image distances relative to the second lens
A pendulum clock is moved from the Mississippi Delta region to the Rockey Mountains. Will theclock run faster or slower in the Rockies? Why? How can it beadjusted to compensate for this change?
An ideal gas is enclosed in a cylinder that has a moveable piston on top. The piston has a mass of 6200 g and an area of 5 cm2 and is free to slide up and down.
the forces acting on the arm of a person lifting a dumbbell. the force f is the force puling on the hand due to the
It's from safety that a person mustn't be hit by an electromagnetic radiation by a high density more than10 mV /cm2 (milli volt /cm2). Describe the safety level in terms of the electric fields and the magnetic fields for an electromagnetic wave sprea..
The construction of a flat rectangular roof (4.7m x5.3m) allows it to withstand a maximum net outward force of20007N. At what wind speed will this roof blow outward
Skateboard with a mass of 3kg is moving at a speed of 5 m/s on a level surface. It encounters a hill and rolls up until it stops. To what vertical height does it rise
A heart pacemaker fires 66 times a minute, each time a 29.0-nF capacitor is charged (by a battery in series with a resistor) to 0.632 of its full voltage
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