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Shravya S

Numerade Educator

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Numerade tutor for 4 years
173 Students Helped

Shravya's Quick Ask Videos

04:01
Physics 101 Mechanics

A particle moves along the X-axis. Its position is given by the equation x = 2 + 3t - 4t^2, with X in meters and t in seconds. Determine:
a) Its position when it changes direction.
b) Its velocity when it returns to the position it had at t = 0.
03:23
Physics 101 Mechanics

A woman stands a distance d from a loud motor that emits sound uniformly in all directions. The sound intensity at her position is an uncomfortable 4.9×10^-3 W/m^2. At a distance 3.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?
02:17
Physics 101 Mechanics

Galileo measured the orbital distances of Jupiter's moons using the diameter of Jupiter as a unit of measure. He found that Io, the closest moon to Jupiter, had an orbital period of 1.8 days and was 4.2 units from the center of Jupiter. Callisto, the fourth moon from Jupiter, has a period of 16.7 days. Using the same units that Galileo did, predict Callisto's distance from Jupiter.
01:51
Physics 101 Mechanics

A diesel locomotive coasting at 10 km/h has an inelastic collision with a stationary flatcar. The locomotive weighs four times as much as the flatcar. How fast does the locomotive-flatcar combination move when stuck together?
05:52
Physics 101 Mechanics

A spelunker is surveying a cave. She follows a passage 130 straight west, then 290 in a direction 45° east of south, and then 280 at 30° east of north. After a fourth unmeasured displacement, she finds herself back where she started.
1- What is the magnitude of the fourth displacement to two significant figures?
2- What is the direction of the fourth displacement?
03:24
Physics 101 Mechanics

A derrick boat approaches a two-mile marker 100 m ahead at a velocity of 31.0 m/s. The pilot reduces the throttle, slowing the boat with a constant acceleration of -2.80 m/s^2.
How long (in s) does it take the boat to reach the marker?
What is the velocity (in m/s) of the boat when it reaches the marker? (Indicate the direction with the sign of your answer.)
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