CJ

Charu J

Numerade Educator

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Numerade tutor for 5 years
82 Students Helped

Charu's Quick Ask Videos

03:02
Physics 101 Mechanics

A block of mass m = 2.2 kg is attached to a string that is wrapped around the circumference of a wheel of radius R = 8.3 cm. The wheel rotates freely about its axis and the string wraps around its circumference without slipping. Initially, the wheel rotates with an angular speed ω, causing the block to rise with a linear speed v = 0.36 m/s. (Figure 1)
Find the moment of inertia of the wheel if the block rises to a height of h = 7.7 cm before momentarily coming to rest.
02:17
Physics 101 Mechanics

The Jupiter-Sun distance is 778 million kilometers, and the
Earth-Sun distance is 150 million kilometers. Suppose an imaginary
line from Jupiter to the Sun forms a right angle with an imaginary
line from Earth to the Sun.
How long would it take light to travel from the Sun to a
spaceship halfway along the straight-line path between Jupiter and
Earth?
Express your answer in minutes.
03:06
Physics 101 Mechanics

A 9.00 kg mass is moving to the right with a velocity of 14.0
m/s. A 12.0 kg mass is moving to the left with a velocity of
5.00 m/s. Assuming that these two balls have a head-on collision
and stick together, what will be the final velocity of the
combination
02:10
Physics 101 Mechanics

To be safe during a lightning storm, it is best to be in which
of the following locations?
In the middle of a grassy meadow
Inside a metal car
Next to a tall tree in a forest
Inside a wooden building
On a metal observation tower
Which are the worst places to be? Justify your choices in a few
sentences.
02:32
Physics 101 Mechanics

a) What is Reynolds Number and its significance? State two differences between laminar flow and turbulent flow.
b) What is the SI unit of kinematic viscosity? What is the value of standard atmospheric pressure?
04:26
Physics 101 Mechanics

An ant is crawling along a straight wire, which we shall call the x-axis, from A to B to C to D (which overlaps A), as shown in the figure below. O is the origin. Suppose you take measurements and find that AB is 38 cm, BC is 17 cm, and AO is 4 cm.

A) What is the ant's position at point A?
B) What is the ant's position at point B?
C) What is the ant's position at point C?
D) What is the ant's position at point D?
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