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1) if 14 billion years ( the approximate current age of the universe) were compressed to 1 year. then on this scale, how many months was the earth (whose true age is about 4.6 billion years) formed after the universe was born.?
2) suppose you wish to construct a scale model of our solar sysytem. the distance between the earth and the sun is 1 astronomical unit (1 AU = 1.5 x 10 ^8km) and you represent this by 15 km.
a- what would the scale model distance of the planet Pluto be? ( Pluto's distance from the sun is 39.5 AU)
b- the earth is about 12800 km in diameter . how large would this be on your scale model?
c- the sun's diameter is about 1.4 x 10^6 km. how large would this be relative to earth?
d- the nearest star to us after the sun is alpha centauri @ 4.2 light years away (4.0 x 10^13 km) how far would this be on your scale model?
An engineer is developing an electric water heater to provide a continuous ("on demand") supply of hot water. What is the power at which the heater operates
A flight attendant pulls her 74 Nflight bag a distance of 318 m along alevel airport floor at a constant velocity. Find the work she does on the flight bag
According to the textbook, a hypothesis is "a causal explanation offered for further investigation or testing." The book provides several methods for testing the quality of a hypothesis. Choose one of the statements below and use one or more of the t..
An 1800-W heater carries a current of 9 A. How much does it cost to operate the heater for 100 min if electrical energy costs 11 cents per kWh
The peak wavelength for the blackbody radiation from a star corresponds to an energy of 2.92x10^ -19 J. what is the temperature of the star at the surface
The air speed indicator of a plane that took off from Detroit reads 343 km/h and the compass indicates that it is heading due east to Boston. Calculate the speed of the plane with reference to the ground
A satellite in Earth orbit has a mass of 92 kg and is at an altitude of 2.04 106 m. (Assume that U = 0 as r ? infinity.) (a) What is the potential energy of the satellite–Earth system? J (b) What is the magnitude of the gravitational force exerted..
A helium-neon laser intended for instructional use operates 7.5 mW. Find out the maximum value of the electric field at a point where the cross sectional area of beam is 10 mm.
A spaceship travels at a constant speed from earth to a planet orbiting another star. How far away is the planet, according to observers on earth
In an experiment designed to measure the speed of light, a laser isaimed at a mirror that is 59.0 km due north. A detector is placed138 m due east of the laser. The mirror is to be aligned so that light from the laser refelects into the detector.
A 4·kg cart is moving to the west at 7·m/s. What is the kinetic energy of the cart
Is the collision completely elastic
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