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Which of the following is a vector quantity?

The next two questions are related to the following situation A crane lifts a steel submarine of density 7800 kg/m3 and mass 20,000 kg.  

You are walking out on a frozen lake and you begin to hear the ice cracking beneath you.  What is your best strategy for getting off the ice safely?

What is the work done (in J) by the shopper as she moves down a 58.0-m length aisle.

Which of the following statements are true about the skater during this process? (There could be more than one correct choice.)

What is the net work done (in J) on the cart?

Consider two containers with the same volume and temperature. Container One holds “dry” air–a mixture of nitrogen and oxygen. Container Two holds “moist” air. The “moist” air has the same ratio of nitrogen to oxygen molecules, but also contains water vapor. According to the ideal gas law, if the pressures are equal, the weight of the gas in Container One will be:

One way to heat a gas is to compress it. A gas at 3.0 atm at 27°C is compressed to three tenths of its original volume, and it reaches 35 atm pressure. What is its new temperature in degrees Celsius?

Which one of the balls hits the ground first?

A hanging weight of mass 9.0-kg is connected by an ideal string going over a zero-mass pulley to a flat 5.0-kg block sliding on a flat table. If the coefficient of sliding (kinetic) friction is 0.19 and the contact surface is 0.36 m2, find the tension in the string (in Newtons).