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A camper is trying to start a fire by focusing sunlight onto apiece of paper. The diameter of the sun is 1.39 x109 m, and its mean distance from the earth is 1.50x 1011 m. The camper is using a converging lenswhose focal length is 10.3 cm. (a) Whatis the area of the sun's image on thepaper? (b) If 0.618 W of sunlight pass through the lens, what is the intensity of the sunlight at the paper?
Suppose you hear a clap of thunder 17.2 s after seeing the associated lightning strike. How far are you from the lightning strike
A window washer pulls herself upward using the bucket-pulley apparatus shown in Fig. 4-42. The mass of the person plus the bucket is 60 kg. (a) How hard must she pull downward to raise herself slowly at constant speed? If she increases this force by ..
a 14 kg steel ball is launched from a cannon at an angle of 20 degrees above the horizontal. the cannon exerted an
A 77-kg man standing on a scale in an elevator notes that as the elevator rises, the scale reads 841 N. What is the acceleration of the elevator
A certain cylindrical drum is 3 meters in height. It filled with with water. Atmospheric pressure is 10^5 Pa, and the density of water is 1000 gl/m^3. What is the water pressure at the bottom of the barrel
A glass rod rubbed with silk acquires a charge of +1.1×10?9 . Is the charge on the silk positive, zero, or negative, How much mass has the glass rod gained or lost
A shell, fired from a cannon, has a muzzle speed (the speed as it leaves the barrel) of 800 ft/s. The barrel makes an angle of 45o with the horizontal and, for ease; the barrel opening is assumed to be at ground level.
I place a 4cm-high object 10cm in front of a 10cm focal length concave lens. How tall is the image
A particular heat engine has a mechanical power output of 6.00 kW and an efficiency of 28.0%, Find the energy taken in during each cycle
A plastic light pipe has an index of refraction of 1.53. For total internal reflection, what is the minimum angle of incidence
You throw a ball horizontally off a roof. the time until it lands is determined only by The height of the roof and it's initial speed
An exoplanet with a mass of 5 times the mass of Jupiter and a radius of 2 Jupiter radii orbits a 3 solar mass star a distance of 10 AU from the star. estimate the orbital velocities of the star and the planet
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