Drag forces in cars depend on the profile the car offers to the air
What will be an ideal response?
This is correct. A wall-like profile has much more air resistance than a teardrop
shape. Most modern automobiles gave profiles more like the teardrop than the wall.
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The attractive force between protons and neutrons in the nucleus is brought about by the exchange of a virtual pi-meson (m? = 140 MeV/c2). Estimate the longest time a ? can exist in accordance with the uncertainty principle ?E??t = h/2?. (h/2? = 1.05 × 10^?34 J?s, 1 eV = 1.6 × 10^?19 C)
a. 3.3 × 10^?18 s b. 2.4 × 10^?21 s c. 4.7 × 10^?24 s d. 6.9 × 10^?27 s
In order for you to get out of bed with the least amount of work, would it be better for your bed to be on the floor or a meter high?
A) It makes no difference, because you must change your position from lying down to standing up in either case. B) It makes no difference, because the total amount of physical work done in either case is zero. C) Both of the above. D) It would be better for the bed to be on the floor, because then you would not need to do as much work to get your feet down onto the floor. E) It would be better for the bed to be a meter high, because then you would not need to do as much work in lifting yourself to your feet.
According to the supermassive black hole hypothesis, how is the energy that powers active galactic nuclei produced?
A) by nuclear fusion near the central black hole B) by magnetic fields that trap and accelerate charged particles C) by the impact of jets being shot out of the central black hole D) by converting the gravitational potential energy of infalling matter to kinetic energy and thermal energy E) by matter—antimatter annihilation
The cores of the terrestrial worlds are made mostly of metal because
A) the terrestrial worlds as a whole are made mostly of metal. B) metals sunk to the centers a long time ago when the interiors were molten throughout. C) the core contained lots of radioactive elements that decayed into metals. D) over billions of years, convection gradually brought dense metals downward to the core.