Grandfather clocks are designed in a way that the weight at the bottom of the pendulum can be moved up or down by turning a small screw. Suppose you have a grandfather clock at home that runs fast
Should you turn the adjusting screw so as to raise the weight or lower the weight? A)
Raise it.
B)
Lower it.
C)
It doesn't matter if you raise or lower the weight, as long as you displace it by the right amount.
D)
It doesn't matter if you raise or lower the weight, as long as you displace it with the correct initial velocity.
E)
Raising or lowering the weight doesn't help, the screw is there so that you can add or take away weight.
B
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A) atoms in proper proportions make us feel good B) atoms are in all the stars in the universe C) an atom is the smallest bit of matter in a material D) none of the above
What is the mass density of argon gas at pressure 1.00 × 105 N/m2 and at temperature 300 K? The mean atomic mass of argon is 39.948 g/mol and the ideal gas constant is R = 8.314 J/mol ? K =
A) 1.40 kg/m3 B) 1.00 kg/m3 C) 1.20 kg/m3 D) 1.60 kg/m3 E) 1.80 kg/m3
Explain why in space, "no one can hear you scream."
What will be an ideal response?
A rocket with an initial mass of 1000 kg adjusts its thrust by varying the rate at which mass is ejected. The ejection speed relative to the rocket is 40 km/s. If the acceleration of the rocket is to have a magnitude of 20 m/s2 at an instant when its mass is 80% of the original mass, at what rate is mass being ejected at that instant? Ignore any external forces on the rocket
a. 0.40 kg/s b. 0.50 kg/s c. 0.60 kg/s d. 0.70 kg/s e. 0.80 kg/s