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A 200-pound boy lifts a 40-kg box off of the floor 1.3 meters in 0.7 seconds. His brother lifts a 48-kg box off thr floor 0.9 meters in 0.6 seconds. Which boy is more powerful. Explain, using equations and a full explanation.
A bolt is to be tightened with a torque of 8.0 Nm. what is the least amount of force you must exert
what is the depth d. what is the angle of refraction.
A material has an index of refraction of 2.050. What is the critical angle for internal reflection inside a block
A simple pendulum has a mass of 0.150 kg and a length of 3.00 m. It is displaced by an angle of 12.0° and then released. What is the utmost speed?What is the maximum angular acceleration?What is the maximum restoring force.
At standard atmospheric pressure, the solid form of carbon dioxide called "dry ice" undergoes a phase change not to a liquid, how much of the water will turn to ice by the time all the dry ice has sublimated
Io, a satellite of Jupiter, has an orbital period of 1.77 days and an orbital radius of 4.22 x 10^5 km. From these data, determine the mass of Jupiter
To finance her community college education, Joanna takes out a Stafford loan for $4500. How much will she pay
A glucose-winged gull, ascending straight upward at 5.20 m/s drops a shell when it is 12.5 m above ground.
A sample of helium behaves as an ideal gas as it is heated at constant pressure from 273 K to 343 K. what is the mass of helium present
A 15m length of wire consists of 6.0m of copper followed by 9.0m of aluminum, both diameter 1.4mm. A voltage difference of 70mV is placed across the composite wire, What is the total resistance (sum) of the two wires
A net force of 7 newtons acts on an object that weighs 49 newtons. What is the resulting acceleration
You're driving down the highway late one night at 18 - {rm m}/{rm s} when a deer steps onto the road 45 -{rm m} in front of you. Your reaction time before stepping on the brakes is 0.50- {rm s}, and the maximum deceleration of your car is 11 {rm m..
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