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A tourist drops a 1-liter water-filled balloon from the top of a monument (170m high). If air resistance is negligible and almost all the motion energy heats the water, find the increase in temperature of the water when it hits the pavement.
(hint: equate mgh in joules to the quantity of heat mc (change) T and express c, the specific heat capicity for water, in terms of joules rather than calories. Use conversion factor 4187J/kg degrees C
35MW of power at 45kV (rms) arrives at a town from a generator via 5.0? transmission lines. Calculate the emf at the generator end of the lines
When four people with a combined mass of 300 kg sit down in a 2.0 103-kg car, they find that their weight compresses the springs an additional 0.65 cm. What is the frequency of the car's vibration
A rope goes over a circular pulley with a radius of 7.5 cm. If the pulley makes four revolutions without the rope slipping, what length of rope passes over the pulley
A small mirror is attached to a vertical wall, and it hangs adistance of 1.82 m above the floor. The mirror is facing due east,and a ray of sunlight strikes the mirror early in the morning andthen again later in the morning.
Your motorboat can move at 30km/h in still water. How much time would it take you to move 12km upstream, in a river flowing at 6km/h.
a contact lens is made of plastic with an index of refraction of 1.58. the lens has an outer radius of curvature of
An object O is located in front of two thin symmetrical coaxial lenses 1 and 2, with focal lengths f1 = 24 cm, f 2 = 9 cm correspondingly, Determine where does the image form
The brake system on the San Francisco cable car uses a wedge pushed into the cable slot. what is the mechanical advantage of the wedge as a braking machine
A box at rest has the shape of a cube 3.5m on a side. This box is loaded onto the flat floor of a spaceship, What is the volume of the box as we observe it
A woman can read the large print in a newspaper only when it is at a distance of 55 cm or more from her eyes. What should be the refractive power (in diopters) of her glasses
An iron bar of mass, 0.82 kg, slides down a frictionless incline 0.29 m high, What is the speed of the combined masses after collision
What minimum coefficient of static friction is required? Is the reply you found reasonable? In other words, is he probable to stay on the merry-go-round.
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