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A lifeguard is working at a pool sitting in his guard stand. He notices a child right below him drowning that appears to be 1.5 m below the surface of the water? How deep is the child actually? Suppose he is sees the child at a very small angle, and utilize the small angle approx. of sinθ= tanθ = θ
Two spaceships approach each other, each moving with the same speed as measured by an observer on the Earth. find the speed of each spaceship as measured on Earth
The cheetah can reach a top speed of 114 km/h (71 mi/h). While chasing its prey in a short sprint, find the cheetah's average acceleration during the short sprint
In each cycle of its operation, a refrigerator removes 17J of heat from the inside of the refrigerator, How much work per cycle is required to operate this refrigerator
question when two moles of hydrogen and one mole of oxygen react to form two moles of water the energy released is 485
A copper wire, whose cross-sectional area is 5.22 x 10-6 m2, has a linear density of 5.86 x 10-3 kg/m and is strung between two walls. At the ambient temperature, a transverse wave travels with a speed of 43.1 m/s on this wire. The coefficient of ..
You measure an electric field of 1.26×106 N/C at a distance of 0.149 m. from a point charge. find the magnitude of the charge
Two blocks of equal massed are connected via a pulley system. The mass of the pulley equals the mass of each block. One block is hanging down from the pulley, and the other is on an inclined plane.
Induced emf measurements can be used to measure the speed of a conducting fluid such as sea water. If a 20 cm inner diameter nonconducting pipe has sea water flowing through it at a flow rate of 10 gal/min and a uniform magnetic field of 0.05 T is ap..
A 15 ohm resistor is connected to the terminal of a 12 V battery, Sketch the circuit and Calculate the current in the circuit
What is the magnitude of the electric force of attraction between an iron nucleus (q=+26e) and its innermost electron if the distance between them is 1.5 x 10^-12m
A baseball outfielder throws a 0.150 kgbaseball at a speed of 45.0 m/s and aninitial angle of 31.0°. What is the kinetic energy of the baseball atthe highest point of its trajectory?
A spy satellite was launched into a circular orbit with a height of 318 km above the surface of the Earth. Determine its orbital speed and period
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