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A boy 10.5 m above the ground in a tree throws a ball for his dog, who is standing right below the tree and starts running the instant the ball is thrown. If the boy throws the ball horizontally at 8.50 m/s.
A. How fast must the dog run to catch the ball just as it reaches the ground?
B. How far from the tree will the dog catch the ball?
An electric train operates on 740 V. What is its power consumption when the current flowing through the train's motor is 1,970 A
A 2000 kg elevator initially is moving with speed 2 m/s as it passes the 5th °oor. How much work is done by nonconservative forces during the 10 second interval
Catapult fires an 800-kg rock with an initial velocity of 100 m/sat a 40° angle from ground. What is the magnitude of the horizontal impulse
At an outdoor market, a bunch of bananas attached to the bottom of a vertical spring of force constant 16.0 N/m is set into oscillatory motion with an amplitude of 20.0 cm
An AC generator supplies an rms voltage of 230 V at 50.0 Hz. It is connected in series with a 0.650 H inductor, a 6.00 ?F capacitor, What is the peak voltage across the capacitor
A pond with a flat bottom has a surface area of 730 m2 and a depth of 2.7 m. Find the rate at which energy is transferred by conduction from the surface to the bottom of the pond
A standing wave in a pipe with both ends open has a frequency of 444 Hz. The next higher harmonic has a frequency of 602 Hz. Determine the fundamental frequency. How long is the pipe?
A cylindrical vessel 16 feet in diameter and 15 in height is constructed to withstand a maximum internalpressure of 500 psia. What is the maximum weight of nitrogen
After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length 53.0cm. What is the magnitude of the gravitational acceleration on this planet
An instructor wants to use a lens to project a real image of a light bulb onto a screen 2.27 m from the bulb. what focal length lens will be needed
You are trying to hit a cart of mass 0.3 kg on a frictionless table with a toy projectile launcher. At what angle relative to North do you want to fire the projectile
An electron is located on a pinpoint having a diameter of 2.5 um. What is the minimum uncertainty in the speed of the electron
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