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When you drink cold water, your body must expend metabolic energy in order to maintain normal body temperature (37.0°C) by warming up the water in your stomach. Could drinking ice water, then, substitute for exercise as a way to "burn calories?" Suppose you expend 480. kilocalories during a brisk hour-long walk. How many liters of ice water (0°C) would you have to drink in order to use up 480. kilocalories of metabolic energy? For comparison, the stomach can hold about 1 liter.
If a rocket's exhaust speed is 160 m/s relative to the rocket, what fraction of its initial mass must be ejected to increase the rocket's speed by 50 m/s
Compute the period of a 0.123-nmX-ray. An object is placed halfway among a concave mirror and its focal point. Discover the resulting magnification. A 3-cm-tall object is located 8 cm in front of a concave mirror that has a 20-cm radius of curvature...
A transparent photographic slide is placed in front of a converging lens with a focal length of 2.33 cm. An image of the slide is formed 11.4 cm from the slide. How far is the lens from the slide if the image is real
A solid marble, a solid disk and a hoop have the same mass (M = 0.9 kg) and the same radius. Each object is held at rest at the same height and then released. what is the force the track exerts on the hoop
A solid sphere rolls down an incline plane without slipping. If the center of mass of the sphere has a linear acceleration of 1.21 m/s2, what is the angle of the incline to the horizontal?
A wheel of radius R = 20.4 cm, mass M = 2.47 kg, and moment of inertia I is mounted on a frictionless, horizontal axle as in the figure. A light cord wrapped around the wheel supports an object of mass m = 0.514 kg.
Consider a copper wire (mass density 8.9 g/cc, resistivity 1.7E-8 ohm-m) with a diameter of 0.43 mm, How many meters long is this wire
One solenoid is centered inside another. The outer one has a length of 54.0 cm and contains 6800 coils, What is the mutual inductance of these solenoids
An 840 kg car needs to round a level curve with a radius of 23m.The driver wants to proceed at 56 kph. How much work does the friction force do on the car
A proton orbits a long charged wire, making 1.6 x 106 revolutions per second. The radius of the orbit is 1.2 cm. whatis the wire's linear charge density
a 0.5kg block at rest on a table is attached to a horizontal spring with a spring constant k200 nm. the spring is
in a typical Van de Graaff linear accelerator, protons are accelerated through a potential difference of 20 MV. What is their kinetic energy if they started from rest
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