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Questions in physics

[Answered] What is measured in watts that starts with a "P"?

[Answered] How do you solve a problem like this: How much force must Mr. McDonald exert to lift a 112 kg object? What would happen if Mr. McDonald exerts more than the required force to lift the object?

[Answered] What does the area under the curve on a velocity versus time graph represent?

[Answered] Explain why mass and weight should not be used interchangeably.

[Answered] An airplane flies due north at 100 m/s through a 30 m/s crosswind blowing from east to west. Determine the resultant velocity of the airplane.

[Answered] At launch, the space shuttle weighs 4.5 million pounds. When it is launched from rest, it takes 8.00 seconds to reach 162 km/h, and at the end of the first 1.00 minute, its speed is 1620 km/h. a) Assuming the acceleration is constant during each time interval (but not necessarily the same in both intervals), what distance does the shuttle travel during the interval from 8.00 seconds to 1.00 minute?

[Answered] The coordinates of a bird flying in the xy-plane are given by \( x(t) = \alpha t \) and \( y(t) = 3.0 \, \text{m} - \beta t^2 \), where \( \alpha = 2.4 \, \text{m/s} \) and \( \beta = 1.2 \, \text{m/s}^2 \). a) Let the direction be the angle that the vector makes with the +x-axis measured counterclockwise. Calculate the direction of the bird's velocity at \( t = 2.0 \, \text{s} \). Express your answer in degrees using two significant figures. b) Calculate the magnitude of the bird's acceleration at \( t = 2.0 \, \text{s} \). Express your answer using two significant figures.

[Answered] What does the slope of a velocity vs. time graph give you?

[Answered] Please explain an easy way to **convert units**. Anything helps.

[Answered] The velocity of the transverse waves produced by an earthquake is 8.9 km/s, while that of the longitudinal waves is 5.1 km/s. A seismograph records the arrival of the transverse waves 73 seconds before that of the longitudinal waves. How far away was the earthquake?