A projectile returns to its original height 4.08 s after being launched, during which time it travels 76.2 m horizontally. If air resistance can be neglected, what was the projectile's initial speed?
What will be an ideal response?
27.4 m/s
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The fact that Voyager 10 continues to speed out of the solar system, even though its rockets have no fuel, is an example of
A) Newton's first law of motion. B) Newton's second law of motion. C) Newton's third law of motion. D) the universal law of gravitation. E) none of the above
A charge of 50-?C is placed on the y axis at y = 3.0 cm and a 77-?C charge is placed on the x axis at x = 4.0 cm. If both charges are held fixed, what is the magnitude of the initial acceleration of an electron released from rest at the origin?
a. 1.2 × 10^20 m/s2 b. 1.5 × 10^20 m/s2 c. 1.0 × 10^20 m/s2 d. 1.8 × 10^20 m/s2 e. 2.0 × 10^20 m/s2
A particle is in the second excited state of a one-dimensional box of length 1.0 m. What is its momentum (in kg × m/s)?
a. 6.6 × 10^-34 b. 3.3 × 10^-34 c. 9.9 × 10^-34 d. 13 × 10^-34 e. cannot be solved unless mass of particle is known
The turntable of a record player has an angular velocity of 8.0 rad/s when it is turned off. The turntable comes to rest 2.5 s after being turned off. Through how many radians does the turntable rotate after being turned off? Assume constant angular acceleration.
A. 12 rad B. 8.0 rad C. 10 rad D. 16 rad E. 6.8 rad