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3 years ago

8

The centripetal force depends on the mass of body, angular velocity and radius of circular path. Find the expression for the cen

tripetal force.

1 answer:

vitfil [10]3 years ago

5 0

Answer:

F = m ω² r

Explanation:

Centripetal force is mass times centripetal acceleration:

F = ma

F = m v² / r

In terms of angular velocity:

F = m (ωr)² / r

F = m ω² r

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pav-90 [236]

Answer:

10 m/s

Explanation:

The potential energy of the roller coaster is converted to kinetic energy. According to law of transformation of energy, potential energy = kinetic energy.

mgh = ½mv².Take g as 10m/s².

150 * 10 * 50 = ½ * 150 * v².

7500 = 75v².

v² = 7500/75.

v = √100.

v= 10 m/s.

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3 years ago

A man ties one end of a strong rope 8.17 m long to the bumper of his truck, 0.524 m from the ground, and the other end to a vert

Kamila [148]

Answer:

2442.5 Nm

Explanation:

Tension, T = 8.57 x 10^2 N

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y = 0.524 m

h = 2.99 m

According to diagram

Sin θ = (2.99 - 0.524) / 8.17

Sin θ = 0.3018

θ = 17.6°

So, torque about the base of the tree is

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thus, the torque is 2442.5 Nm.

8 0

4 years ago

Which feature of a heating curve indicates a change of state

ziro4ka [17]

Answer:

The diagonal or the inclined lines shows the changes in terms of temperature, and the horizontal lines shows the changing of phases.

Explanation:

hope it is useful

3 0

3 years ago

تقطع اولا مسافة 8 km شمالا من البيت ثم تمشي شرقا حتى تكون ازاحتك من البيت 10km ما مقدار المسافة التي قطعتها شرقا

Natali [406]

He moved 2 km
I speak arabik ;)

8 0

3 years ago

An object starts from rest and accelerates uniformly in a straight line in the positive x direction. After 11 seconds, its speed

vladimir1956 [14]

Answer:

$v_{avg}=35m/s$

Explanation:

To calculate the average velocity we must know the distance traveled and do $v_{avg}=\frac{d}{t}$ . The distance traveled is $d=\frac{at^2}{2}$ , so we need to calculate the acceleration, which, since it's uniform, is $a=\frac{\Delta v}{\Delta t}=\frac{v_f}{t}$ . Putting all together:

$v_{avg}=\frac{d}{t}=\frac{at^2}{2t}=\frac{at}{2}=\frac{v_ft}{2t}=\frac{v_f}{2}=35m/s$

4 0

3 years ago