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A boy reaches out of a window and tosses a ball straight up with a speed of 13m/s . The ball is 23m above the ground as he releases it.
A. Use energy to find the ball's maximum height above the ground. Express your answer to two significant figures and include the appropriate units.
B. Use energy to find the ball's speed as it passes the window on its way down. Express your answer to two significant figures and include the appropriate units
C. Use energy to find the speed of impact on the ground. Express your answer to two significant figures and include the appropriate units.
Consider a Universe where matter density is 0, and it has a significant cosmological constant. How old is the Universe in this case
A square, single turn coil 0.20m on a side is placed with its plane perpendicular to a constant magnetic field. An emf of 18mV is induced in the coil winding as the area of the coil decreases at the rate of 0.10m2/S. What is the magnitude of the m..
In very cold weather, a significant mechanism for heat loss by the human body is energy expended in warming the air taken into the lungs with each breath. How much heat is lost per hour if the respiration rate is 19.0 breaths per minute
An anchor holding a boat stationary on a river forms a 65 degree angle with the river bottom. The anchor line is 40 meters long. Assume the river has a uniform depth, how deep is the river directly below boat.
Continuation of Problem 8 and Problem 37. Another explanation for the sliding stones of Racetrack Playa in Death Valley, what is the required wind speed near the sheet
From the instant particle 1 enters region A for the first time, until it leaves region B, how much time elapses? If particle 2 has the same mass and the same speed as particle 1, what is the charge on particle 2?
At the bottom, it hits another stationary car with equal mass. The two cars have Velcro and stick together. At what speed do the two cars move after the collision
21.18 g of copper pellets are removed from a 286°C oven and immediately dropped into 198.5 mL of water at 13°C in an insulated cup
A 55-cm-long wire with a mass of 10.6 g is under a tension of 53.0 N. Both ends of the wire are held rigidly while it is plucked. What is the frequency of the third harmonic
question four 75kg spheres are located at the corners of a square of side 0.60m. calculate the magnitude and direction
300 g of water at 45°C are poured into an 800-g aluminum container with an initial temperature of 10°C. The specific heat of aluminum is 900 J/(kg·K). What is the final temperature of the system
A roller coaster car of mass 250 kg has a speed of v0 = 12 m s-1 at point A, located at a height of h = 15 m. Find the speed of the car when it reaches point B. Use energy ideas
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