mary is standing on a bathroom scale in an elevator. the scale reads 500 N. the elevator accelerates upward with the acceleration of 5.0 m/s^2. what would the scale read?
What is an object's final velocity that was traveling at 15.9 m/s then accelerated at the rate of 2.5 m/s2 for 14.2 seconds?
A 50.0 g Super Ball traveling at 29.0 m/s bounces off a brick wall and rebounds at 16.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.00 ms, what is the magnitude of the average acceleration of the ball during this time interval?
A baseball pitcher throws a ball with a maximum speed of 150. km/h. If the ball is thrown horizontally, how far does it fall vertically by the time it reaches the catcher's glove 20. m away?
The pulley system in the figure is used to lift a crate of mass m = 42 kg. Note that a chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume that the masses of the chains, pulleys, and ropes are negligible. Determine the tension in the...
A Federation starship ( 1.90 106 ) uses its tractor beam to pull a shuttlecraft ( 1.80 104 ) aboard from a distance of 18.0 away. The tractor beam exerts a constant force of on the shuttlecraft. Both spacecraft are initially at rest.
A projectile is fired straight upward at 105 m/s. How fast is it moving at the instant it reaches the top of its trajectory? Answer in units of m/s.
A car is traveling at 18 m/s when the driver spots a large pothole in the road a distance 31 m ahead. She immediately applies her brakes. If her acceleration is -6.2 m/s2, does she manage to stop before reaching the pothole?
A car is traveling 24 m/s when the driver sees a child standing on the road. He takes 0.8 s to react, then steps on the brakes and slows at 6.0 m/s2. How far does the car go before it stops?
two cars are traveling on a desert road, as showin in figure 2-22. After 5.0s they are side by side at the next pole. The distance between the poles is 70.0 a) the displacement of care A after 5.0s b) the displacement of car B after 5.0's c) The average velocity of car A during...
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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