motion?
Physics, 10.01.2020 02:31 darkskinnednune
Which of the following is true about a planet orbiting a star in uniform circular
motion?
a. the velocity vector of the planet points toward the center of the
circle
b. the speed of the planet is always changing.
o
c. the velocity of the planet is constant.
d. the acceleration vector of the planet points toward the center of
the circle.
Answers: 1
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When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false
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Physics, 21.06.2019 22:40
Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.
Answers: 3
Physics, 22.06.2019 16:30
An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?
Answers: 1
Which of the following is true about a planet orbiting a star in uniform circular
motion?
motion?
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