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You swing a 3.00 {\rm kg} stone in a circle, using the full length of a thin 60.0 {\rm cm} rope. At what speed should you swing it so its acceleration will be 9.8 {\rm m/s^2}?
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What is the kinetic energy in joules of a 1009 kg automobile traveling at 94 km/h?
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A hotel elevator ascends 170 with a maximum speed of 4.2 . Its acceleration and deceleration both have a magnitude of 1.0 . How far does the elevator move while accelerating to full speed from rest?
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When a 145 N bag of nails hangs motionless from a single vertical strand of rope, how much tension is exerted in the strand?
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A hunter wishes to cross a river that is 1.5 km wide and flows with a speed of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 14 km/h with respect to the water. What is the minimum time necessary for crossing? 1 min
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An object of mass m is traveling on a horizontal surface. There is a coefficient of kinetic friction mu between the object and the surface. The object has speed v when it reaches x = 0 and encounters a spring. The object compresses the spring, stops, and then recoils and travels in the...
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A 280 g block on a 54 cm-long string swings in a circle on a horizontal, frictionless table at 75 rpm.
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what is niagara falls the human history about
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What is the joule heat loss per minute in the resistor if the batteries are connected in series?
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A box of mass 3.5 kg rests on a frictionless shelf and is attached by strings to boxes of masses m1 = 1.5 kg and m2 = 2.5 kg which hang freely as shown in fig 12 below. Ignoring friction, find (a) the acceleration of each of the boxes, and (b) the tension in each string.
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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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