From the equation F=mv^2/r, calculate the tension in a 2-m length of string that whirls a 1-kg mass at 2 m/s in a horizontal circle.

Why is the middle seating most comfortable in a bus traveling along a bumpy road?

Calculate the force of gravity between a newborn baby (mass =4 kg) and the planet Mars (mass=6.4 x 10^23 kg), when Mars is at its closest to Earth (distance = 8 x 10^10 m).

Describe an ellipse.

Kepler’s second law is the ratio of the squares of the periods of any two planets revolving around the sun is equal to the ratio of the cubes of their average distance from the sun.

As a planet moves in its orbit, a line from the sun to the planet sweeps out equal areas in equal times. This is Kepler’s ____ law.

In the Olympic hammer-throw event, an athlete throws a 7.3 kg lead ball attached to a 1.2 m cable. The athlete swings the ball in a circle three or four times before letting it go. If the ball attains a speed of 27 m/s, how much tension is there?

Which balancing act in the figure is in stable equilibrium? (See Picture on shared screen))

Which balancing act in the figure is in neutral equilibrium? (See Picture on Shared Screen)

Which balancing act in the figure is in unstable equilibrium? (See Picture on Shared Screen)

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