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select the quantity that has changes-velocity or speed-for a car that travels north at 88 km/h and then turns east while continuing to move a 88km/h. explain your answer.
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A Texas cockroach of mass 0.17 kg runs counterclockwise around the rim of a lazy Susan (a circular disk mounted on a vertical axle) that has radius 15 cm, rotational inertia 4.5 10-3 kg m2, and frictionless bearings. The cockroach's speed (relative to the ground) is 2.0 m/s, and the lazy...
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A 50.0 kg child takes a ride on a Ferris wheel that rotates four times each minute and has a diameter of 24.0 m
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A car of mass M = 1100 kg traveling at 60.0 km/hour enters a banked turn covered with ice. The road is banked at an angle theta, and there is no friction between the road and the car's tires. What is the radius r of the turn if theta = 20.0^\circ (assuming the car continues in uniform...
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A block of mass = 2.1 kg is attached to a string that is wrapped around the circumference of a wheel of radius = 8.0 cm. The wheel rotates freely about its axis and the string wraps around its circumference without slipping. Initially the wheel rotates with an angular speed , causing the block...
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A 1200 kg car carrying four 75 kg people travels over a washboard dirt road with corrugations 3.8 m apart. The car bounces with maximum amplitude when its speed is 13 km/h. When the car stops, and the people get out, by how much does the car body rise on its suspension?
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A car starts from rest and then accelerates uniformly to a linear speed of 16 m/s in 42 s. If the tires have a radius of 27 cm, what are the following? (a) the average linear acceleration of a tire 0.381 m/s2 (b) the angular acceleration of a tire 1.41 rad/s2 (c) the angular...
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A steel building is 107 m tall when the outside temperature is 0 C. How tall is the building on a hot summer day (33 C)? The change in height is small, so express your answer with 3 decimal places.
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This star map shows stars as we see them in our sky from Earth, centered around the constellation Canis Major. Larger dots represent brighter stars, and a few of the brightest stars are identified. From this view alone, what can you conclude about Sirius?
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A 23.0 kg gold bar at 25.0 C is placed in a large, insulated 0.800 kg glass container at 15.0 C with 2.00 kg of water at 25.0 C. Calculate the final equilibrium temperature.
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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?
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- 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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