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An elastic cord is 61 long when a weight of 78 hangs from it but is 81 long when a weight of 190 hangs from itExpress your answer using two significant figures.
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A banked circular highway curve is designed for traffic moving at 61 km/h. The radius of the curve is 199 m. Traffic is moving along the highway at 48 km/h on a rainy day. What is the minimum coefficient of friction between tires and road that will allow cars to negotiate the turn without sliding...
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A motorist travelling at 87 km/hr is being chased by a police car at 122 km/hr. If the police car starts from 2.5 km back, how long does it take to catch the motorist? Leave time in hours.
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A painter of mass 70.0 kg stands on a platform of mass 75.0 kg and pulls on two ropes which hang over pulleys, as shown. He pulls each rope with a force of 850.0 N. Assuming a coordinate system where +y is up, calculate the y-component of the acceleration ay. ay can either be positive or negative...
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A 18000 airplane lands with a speed of 82 on a stationary aircraft carrier deck that is 115 long.
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If another ball rolls off the same table at 0.63 , how far from the base of the table does it hit? If another ball rolls off the same table at 0.63 , how far from the base of the table does it hit?
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4. In below shown figure, a laser beam of power 5.35W and diameter 2.60mm is directed upward at one circular face ( of diameter d < 2.60mm) of a perfectly reflecting cylinder.The cylinder is levitated because the upward radiation force matches the downward gravitational force. If the...
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Which one or more of the following rigid objects of mass (M) has the greatest moment of inertia; a thin walled hollow cylinder, a solid cylinder, a solid sphere, a thin-walled spherical shell, or a thin rectangular sheet? All objects rotate about an axis passing through its center.
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A gun is fired horizontally at a block of wood, which is initially at rest on a horizobntal floor. The bullet becomes imbedded in the block, and the impact causes the system to slide a certain distance, s, before coming to rest. What is the inital speed of the bullet? (Mass of bullet=10g, Mass...
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Two ants race across a table 57 cm long. One travels at 5.25 cm/s and the other at 2 cm/s. When the first one crosses the finish line, how far behind is the second one? Answer in units of cm.
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- 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
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