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You are going to lift an elephant (mass = 2.6 103 kg) over your head (1.9 m vertical displacement).
(a) Calculate the work required to do this. You will lift the elephant slowly (no tossing of the elephant allowed!). If you want, you can use a pulley system. (This does not change the energy required to lift the elephant, but it definitely reduces the force required to do so.)
(b) How many doughnuts (260 food calories each) must you metabolize to supply the energy for this feat? (Assume the body converts 100% of the food energy into mechanical energy.)
Two astronauts floating at rest with respect to their ship in space decide to play catch with a3-kg asteroid. What is Joe's speed right after his first catch
What diameter has the tip of the second hand with 100mil/hr tangential speed? What diameter has the tip of the minute hand with 100mil/hr tangential?
You are piloting a spacecraft whose total mass is 1130 kg and attempting to dock with a space station in deep space. What is the initial thrust exerted on your spacecraft by the retro-rocket? What is the thrust's direction (positive if in the direc..
A soccer player kicks a ball, giving it an initial velocity of 17.2 m/s in the horizontal direction, How far down the field does the ball travel before landing
A 0.31 MeV x-ray photon collides with an electron and scatters straight back the way that it came. What is the energy of the backscattered photon
In order to clearly read a book 24 cm away, a farsighted girl needs an image to be 35 cm from her eyes. What focal length is necessary for lens in her eyeglasses.
A transparent oil with index of refraction 1.22 spills on the surface of water (index of refraction 1.33), determine the thickness of the oil slick
A square panel with sides of length 8 inches is 1 inch thick and has a thermal conductivity of 0.53 W K?1 m?1. find the rate of heat transfer through the thickness of the panel
The 40 kg man in the roller coaster car is sitting on a bathroom scale. If he is travelling at 35.3 m/s at the point shown and the radius of vertical coaster track is 53 meters, to the nearest newton what does the scale read?
A 15µ F capacitor is joined in series with a 35µ F capacitor and a 12 Volts battery. How much energy is stored by the second capacitor
If 0.260kg of blood at a temperature of 37.0 ? C flows to the surface and loses 1400J of heat, what is the temperature of the blood
A block with mass m = 5.00kg slides down a surface inclined 36.9 ? to the horizontal (the figure (Figure 1) ). The coefficient of kinetic friction is 0.27. What is the acceleration of the block down the plane
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