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A speedboat of mass 539 kg (including the driver) is tethered to a fixed buoy by a strong 33.3-m cable. The boat's owner loves high speed, but doesn't really want to go anywhere. So he revs up the boat's engine, makes a lot of noise, and runs the boat in circles around the buoy with the cable supplying all the necessary centripetal force. When the tension of the cable is steady at 1.29 × 104 N, with what force is the boat's engine pushing the boat? Different physics textbooks treat drag force somewhat differently and use different formulas. For the present purpose, take the water's drag force on the boat to be 450v2, where v denotes the boat's speed. Ignore any drag force on the cable.
At a soft drink dispenser, a restaurant patron put 0.2 kg of crushed water ice, at a temperature of ?5 C, into an insulating cup. [In fact, the ice was slightly colder before it left the machine, but its warming to ?5 C cooled the inside surface o..
The definition of power differs from the definition of work in that the former always involves...
A full length mirror on a closet door is 2.0 m tall. The bottom touches the floor. How long is the streak of reflected light across the floor
The average speed of the atoms in a 3.9 g sample of helium gas is 607 m/s. Estimate the thermal energy of the sample
If you shake one end of a taut rope steadily five times each second, what would be the period of the sinusoidal wave set up in the rope
The drawing shows one horizontal wire with the current going up and one vertical wire with the current going to the right. Point A is dH to the right and dV above the intersection. Point B is dH to the left and dV below the intersection.
a cosmic ray travels 60 km through the earths atmosphere in 390 ?s as measured by experimenters on the ground.how long
A spherical capacitor is formed from two concentric,spherical, conducting shells separated by a vacuum. The innersphere has a radius of 15 cm. What is the radius of the outer sphere
A steel cable has a cross-sectional area 3.44 × 10-3 m2 and is kept under a tension of 3.33 × 104 N. At what speed does a transverse wave move along the cable
a 3.4-cm-diameter circle lies in the xy-plane in a region where the electric field is E=(1300i + 1300j + 1300k) N/C. What is the electric flux through the circle
Superman leaps in front of Lois Lane to save her from a volley of bullets. In a 1-minute interval, an automatic weapon fires 148 bullets, Find the average force exerted on Superman's chest
A 1000kg sports car accelerates from 0m/s to 33m/s in 13s. What is the average power of the engine
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