
A 2049 kg elevator moves with an upward acceleration of 1.7 m/s2. What is the tension in the cable that supports the elevator?

Suppose you wanted to reach Alpha Centauri in 135 years.

A 28 kg loudspeaker is suspended 2.5 m below the ceiling by two cables that are each 50 degrees from vertical. What is the tension in the cables?

Starting from rest, a boat increases its speed to 4.32 with constant acceleration. What is the boat's average speed??

How long does it take photons to travel from the Sun to the Earth? (For this question, please assume 1 AU = 1.5x1011 m.)

The force exerted by the wind on the sails of a sailboat is 380 N north. The water exerts a force of 160 N east. If the boat (including its crew) has a mass of 330 kg, what are the magnitude and direction of its acceleration?

The force exerted by the wind on the sails of a sailboat is 400 N north. The water exerts a force of 240 N east. If the boat (including its crew) has a mass of 270 kg, what are the magnitude and direction of its acceleration?

Starting from rest, a boat increases its speed to 4.07 with constant acceleration. What is the boat's average speed?

what is application of momentum and impulse in transportation?

Suppose the coefficient of friction between the road and the tires on a car is 0.60 and that the car has no negative lift (so that the normal force on the car from the road is equal to the weight). What speed will put the car on the very of sliding as it rounds a level curve of 30.5 m radius?
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Sample Questions
 The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
 (a) What is the average angular acceleration of the Earth?
 (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
1. Can you show me step by step how to solve this problem?:
 A spherical balloon is made from a material whose mass is 3.00kg. The thickness of the material is negligible compared to the 1.5m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19kg/m^3. Find the absolute pressure of the helium gas
2. I do not understand this Ideal Gas Law and Kinetic Theory question. Can you help me set it up?
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