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A 66 kg woman cheats on her diet and eats a 643 Calorie (540 kcal) jelly donut for breakfast.
a) How many joules of energy is the equivalent of one jelly doughnut?
b) How many stairs should the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut? Suppose the height of a single stair is 15 cm.
c) If the human body is only 30% efficient in converting chemical energy to mechanical energy, how many stairs should the woman climb to work off her breakfast?
The heels on a pair of women's shoes have radii of0.50 cm at the bottom. find the stress on each heel
When the door of the Chapel of the Mausoleum in Hamilton, Scotland, is slammed shut, If that echo were due to a single reflection off a wall opposite the door, how far from the door would that wall be
An air conditioner draws 19A at 220-V ac. The connecting cord is copper wire with a diameter of 1.291mm, If the length of the cord (containing two wires) is 6.5m , how much power is dissipated in the wiring
An airplane is flying by a velocity of at an angle of above the horizontal. When the plane is a distance directly above a dog that is standing on level ground, a suitcase drops out of the luggage compartment. How far from the dog will the suitcase la..
A mosquito collides head on with a car traveling 60 mph. How do you think the size of the force the car exerts on the mosquito compares to the size of the force that the mosquito exerts on the car.
A standing wave on a 75.0cm long string has three antinodes. The Wavelength is .50m. If the string has linear mass density 3.78×10?5kg/m and tension 10.5N , what are the wave's frequency
A spaceship leaves Earth traveling at 0.65 c. A second spaceship leaves the first at a speed of 0.80 c with respect to the first. Calculate the speed of the second ship with respect to Earth if it is fired directly backward toward Earth
A 12-gram bullet is fired at 1600 m/sinto the wooden block of a ballistic pendulum, causing it to swingback, raising up 1.40 meters vertically. Find the mass of the block.
While painting the top of an antenna 206 m in height, a worker accidentally lets a 1.30-L water bottle fall from his lunchbox. The bottle lands in some bushes at ground level and does not break. If a quantity of heat equal to the magnitude of the cha..
A student places her 350 g physics book on a frictionless table. She pushes the book against a spring, compressing the spring by 4.0 cm, What is the book's speed as it slides away
a 196-g aluminum calorimeter contains 582 g of water at 18deg c. a 92-g piece of ice cooled to -18deg c is placed in
What is the frequency of string that was tightened.How high does it rise above the ground.
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