What is the acceleration of a skier that goes from 2.50 m/s to 14.5 m/s while traveling 505 m down a slope?

What is happening to the earth's field right now.

Pie

It is bracking down because of all the pollutoin

8 0

3 years ago

It is well known that for a hollow, cylindrical shell rolling without slipping on a horizontal surface, half of the total kineti

miskamm [114]

<u>The fraction of the total kinetic energy that is rotational for a uniform sphere is</u><u> 1/3.</u>

<h3>What is kinetic energy?</h3>

Kinetic energy is a form of energy that an object or a particle has by reason of its motion.
If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.

Option (a) $f = \frac{0.5}{1.5} = \frac{1}{3}$

Option (b) uniform sphere

$f = \frac{2}{7}$

C) uniform hollow sphere

$f = \frac{2}{5}$

D) uniform hollow cylinder with inner radius R/2 and outer radius R

$f = \frac{5}{13}$

that fraction of total energy as rotational energy is given as

$f = \frac{\frac{1}{2}Iw^{2} }{\frac{1}{2}mv^{2} + \frac{1}{2} Iw^{2} }$

$f = \frac{m k^{2}(\frac{v^{2} }{R^{2} }) }{mv^{2} + m k^{2}(\frac{v^{2} }{R^{2} } )}$

$f = \frac{\frac{k^{2} }{R^{2} } }{1 + \frac{k^{2} }{R^{2} } }$

A) uniform Solid cylinder for cylinder we know that

$\frac{k\\ ^{2} }{R^{2} }$ = 0.5

$f = \frac{0.5}{1.5} = \frac{1}{3}$

B) uniform Sphere for sphere we know that

$\frac{k^{2} }{R^{2} } = \frac{2}{5} \\$

$f = \frac{0.4}{1.4} = \frac{2}{7}$

C) uniform hollow sphere for hollow sphere we know that

$\frac{k^{2} }{R^{2} } = \frac{2}{3}$

$f = \frac{\frac{2}{3} }{\frac{5}{3} } = \frac{2}{5}$

D) uniform hollow cylinder with inner radius R/2 and outer radius R for annular cylinder

$\frac{k^{2} }{R^{2} } = \frac{5}{8}$

$f = \frac{\frac{5}{18} }{\frac{13}{8} } = \frac{5}{13}$

Learn more about kinetic energy

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<u>The complete question is -</u>

It is well known that for a hollow, cylindrical shell rolling without slipping on a horizontal surface, half of the total kinetic energy is translational and half is rotational. What fraction of the total kinetic energy is rotational for the following objects rolling without slipping on a horizontal surface?Part AA uniform solid cylinder.Part BA uniform sphere.Part CA thin-walled hollow sphere.Part DA hollow, cylinder with outer radius R and inner radius R/2.

4 0

2 years ago

An example of a folkway violation would be driving 70 mph in a 50-mph zone. Group of answer choices True False

shutvik [7]

Answer:

Yes.

Explanation:

That is also a law violation.

3 0

3 years ago

The x vector component of a displacement vector has a magnitude of 146 m and points along the negative x axis. The y vector comp

larisa86 [58]

Answer:

a) the magnitude of r is 184.62

b) the direction is 37.74° south of the negative x-axis

Explanation:

Given the data in the question;

as illustrated in the image blow;

To find the the magnitude of r, we will use the Pythagoras theorem

r² = y² + x²

r = √( y² + x²)

we substitute

r = √((-113)² + (-146)²)

r = √(12769 + 21316 )

r = √(34085 )

r = 184.62

Therefore, the magnitude of r is 184.62

To find its direction, we need to find ∅

from SOH CAH TOA

tan = opposite / adjacent

tan∅ = -113 / -146

tan∅ = 0.77397

∅ = tan⁻¹( 0.77397 )

∅ = 37.74°

Therefore, the direction is 37.74° south of the negative x-axis

7 0

3 years ago

Which of these is a risk associated with texting?

Sedbober [7]

Can you provide the answers please :)

7 0

3 years ago