ASSUME: For all parts of this question, friction is negligible. A rope is tied to a box of mass m = 156 g sitting at rest on a horizontal, frictionless surface. The rope is pulled by force F = 9.54
A 2500 kg race car is traveling around a flat circular race trace of radius 230m. What is the minimum coefficient of static friction required between the tires and the race track if the car is t
A government agency estimated that air bags have saved over 14,000 lives as of April 2004 in the United States. (They also stated that air bags have been confirmed as killing 242 people, and they stre
A probe in deep space is infested with alien bugs and must be blown apart so that the icky creatures perish in the interstellar vacuum. The craft is at rest when its self-destruction device is detonat
A quarterback is standing stationary waiting to make a pass when he is tackled from behind by a linebacker moving at 4.75 m/s. The linebacker holds onto the quarterback and they move together in the s
A ring with a clockwise current (as seen from above the ring) is situated with its center directly above another ring, which has a counterclockwise current, as shown in the figure. In what direction i
Which of the following is an accurate statement? Answer a. The magnetic force on a moving charge does not change its energy. b. Magnetic field lines have as their sources north and south poles.
Highway curves are marked with a suggested speed. If this speed is based on what would be safe in wet weather, estimate the radius of curvature for a curve marked 55 km/h. The coefficient of static fr
An ice skater starts out traveling with a velocity of ( 3.0, 7.0) m/s. He performs a 3.0 second maneuver and ends with a velocity of (0, 5.0) m/s. (a) What is his average acceleration over this per
The Earth moves in a roughly circular orbit around the Sun, at an average distance from the Sun of 1.49589 1011 meters over a period of 365.24 days. The coordinate system is fixed, with the sun at t
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1. Can you show me step by step how to solve this problem?:
- 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?
2. I do not understand this Ideal Gas Law and Kinetic Theory question. Can you help me set it up?
- A spherical balloon is made from a material whose mass is 3.00-kg. The thickness of the material is negligible compared to the 1.5-m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305-degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19-kg/m^3. Find the absolute pressure of the helium gas