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Two cannons, aimed at each other, stand on roofs of two identical (meaning same height) very tall buildings, 100 meters apart. Both cannons are fired at the same time. However, one cannonball is bigger and so it is fired at 20 m/s, while the other cannonball is smaller and so it is fired at 30 m/s. a) Will the cannonballs hit each other?
your friend rides a bicycle along the edge of a river starting at point a and riding east at a constant speed of vbike.
150ml of water at 20.0C is placed in the freezer compartment of a refrigerator with a coefficient of performance of 6.00. How much heat energy is exhausted into the room
The rotational velocity of a merry-go-round increases at a constant rate from 0.6 rad/s, What is the rotational acceleration of the merry-go-round
How long does it take electrons to get from a car battery to the starting motor? Assume the current is 310 A and the electrons travel through a copper wire with cross-sectional area 0.49 cm2 and length 0.85 m. ?
A 4 kg ball is raised a vertical distance of 2 meters. Using the conservation of energy principle calculate the final speed of the ball right before it hits the ground
In her bathroom, Mindy has an overhead heater that consists of a coiled wire made of nichrome that gets hot when turned on. calculate the resistance of the heater when it is turned on
In order to pass a physical fitness test, Marcella must run 1000 m at an average speed of 3.90 m/s. How much time does she have to run the last 750 m
A 250 kV power transmission line carrying 500 A is hung from grounded metal towers by ceramic insulators, What fraction of the power carried by the line is this
A physicist\'s left eye is myopic (i.e., nearsighted). This eye can see clearly only out to a distance of 21 cm. what is the power in Diopters
A 2-m string with a mass of 100 g has an applied tension of 100 N while it is plucked. How long does it take the resulting wave to go from one end of the string to the other?
an object lifted 10 meters gains 200 j of potential energy. if the same object is lifted 20 meters its potential energy
White light is incident normally on a thin soap film having an index of refraction of 1.34. What is the thickness of the soap film
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