The central core inside an atom is
a. the electron.
b. the proton.
c. the neutron.
d. the nucleus.
e. none of the above.
d
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A water rocket built from a two-liter bottle half-filled with water pressurized with compressed air can develop a thrust of 300 N
At what rate would water have to come out of the rocket to develop that thrust? The jet of water emerging from the bottle has a diameter of 2.20 cm and the density of water is 1000 kg/m3. A) 2.70 kg/s B) 5.30 kg/s C) 10.7 kg/s D) 32.1 kg/s E) 21.4 kg/s
Nuclear reactors that produce consumer power in present times are powered by
A) fission. B) fusion. C) both fission and fusion.
Sometimes on a hot day a distant dry street appears wet, which is due to
A) water from a previous rainfall. B) reflection of the sky from the street. C) refracted sky light.
A solid wood door, 90.0 cm wide by 2.00 m tall has a mass of 35.0 kg. It is open and at rest
A small 500-g ball is thrown perpendicular to the door with a speed of 20.0 m/s and hits the door 60.0 cm from the hinged side. The ball rebounds with a speed of 16.0 m/s along the same line. What is the angular speed of the door just after the collision with the ball? A) 0.127 rad/s B) 0.925 rad/s C) 1.14 rad/s D) 2.28 rad/s E) 4.57 rad/s