An object on the flat bed of a truck that is accelerating along a straight horizontal road. The coefficient of static friction is 0.300 in this case. Of the following choices, which is the lowest value of acceleration that would result in the object sliding on the bed of the truck?
a. 0.280 m/s2
b. 0.310 m/s2
c. 2.93 m/s2
d. 2.99 m/s2
e. 3.02 m/s2
d
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Figure 4–53 shows a block (mass mA) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second block which hangs vertically.
(a) Draw a free-body diagram for each block, showing the force of gravity on each, the force (tension) exerted by the cord, and any normal force.
(b) Apply Newton’s second law to find formulas for the acceleration of the system and for the tension in the cord. Ignore friction and the masses of the pulley and cord.
Consider two future observatories in space. Observatory X consists of a single 50-meter telescope. Observatory Y is an interferometer consisting of five 10-meter telescopes, spread out over a region 100 meters across
Which observatory can detect dimmer stars, and which one can see more detail in its images? (Assume all else is equal, such as quality of optics, types of instruments, and so on.) A) Observatory X can detect dimmer stars and Observatory Y reveals more detail in images. B) Observatory Y can detect dimmer stars and Observatory X reveals more detail in images. C) Observatory X both detects dimmer stars and reveals more detail in images. D) Observatory Y both detects dimmer stars and reveals more detail in images.
Perhaps the MOST convincing piece of evidence suggesting that Europa has a subsurface ocean is the
A) fact that the magnetic field of Jupiter is able to induce a magnetic field in Europa consistent with a salty ocean beneath its crust B) fact that calculations suggest that there is enough internal heat to keep the ice melted beneath the crust C) lack of impact craters on its surface D) observation of iceberg-like features on its surface
The maximum value of the electric field in an electromagnetic wave is 2.0 V/m. What is the maximum value of the magnetic field in that wave? (c = 3.0 × 108 m/s)
A) 6.7 pT B) 6.7 mT C) 6.7 nT D) 6.7 ?T E) 6.7 T