A block attached to an ideal spring of spring constant 15 N/m executes simple harmonic motion on a frictionless horizontal surface
At time t = 0 s, the block has a displacement of -0.90 m, a velocity of -0.80 m/s, and an acceleration of +2.9 m/s2 . The mass of the block is closest to
A) 2.3 kg
B) 2.6 kg
C) 4.7 kg
D) 9.4 kg
C
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Dark energy is the name of the
a. force that lead to the inflationary period of the Universe. b. five-dimensional space of the Universe. c. force suspected to cause the current acceleration in the rate of expansion of the Universe. d. one of the particles of dark matter related to WIMPs. e. the force that holds the proton together.
First Law of Thermodynamics: A sealed rigitd tank contains 30 moles of an ideal gas, at an initial temperature of 270 K. The pressure of the gas is increased until the final pressure equals 1.40 times the initial pressure. The heat capacity at constant pressure of the gas is 32.0 J/mol ? K. What is the change in the internal (thermal) energy of the gas during this process? (R = 8.31 J/mol ? K)
A. 77 kJ B. 100 kJ C. 130 kJ D. -50 kJ E. -23 kJ
Tightrope walkers often employ a long pole to help them retain their balance. What advantage is there to using a very flexible pole so that the ends droop?
What will be an ideal response?
The ______________ scale gives an absolute measure of the energy released by an earthquake
Fill in the blank(s) with correct word