How does friction act as an unbalanced force for objects in motion?

1 answer:

8 0

Friction is a force that acts in a direction opposite to motion. If there were not force of friction, a baseball player would never stop and would be continuously moving in the direction of motion. Balanced forces do not cause a nonmoving object to start moving.

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How many types of protenies are there in all life as we know it

Sever21 [200]

let me know!! i need the same answer,

8 0

3 years ago

A satellite is spinning at 0.01 rev/s. The moment of inertia of the satellite about the spin axis is 2000 kg · m2. Paired thrust

enyata [817]

Answer:

Explanation:

Angular velocity of satellite

= 2π x .01

= .02 π rad /s

Initial angular momentum

Moment of inertia x angular velocity

= 2000 x .02 π

= 125.6 unit

Linear impulse produced by each thruster

= 15 N.s

Angular impulse

= 15 x 1.5 = 22.5 unit

Total angular impulse in 30 pulses

= 22.5 x 2 x 30

1350

This angular impulse will add total angular momentum of

1350 unit

So total angular momentum after 30 pulses

= 1350 + 22.5

= 1372.5 unit

So final angular velocity

= final angular momentum / moment of inertia

= 1372.5 / 2000

= 0 .686 rad /s

3 0

3 years ago

A Carnot air conditioner takes energy from the thermal energy of a room at 63°F and transfers it as heat to the outdoors, which

vodomira [7]

Answer:

For the Carnot air conditioner working as a heat pump between 63 and 100°F , It would transfer 3.125 Joules of heat for each Joule of electric energy supplied.

Explanation:

The process described corresponds to a Carnot Heat Pump. A heat pump is a devices that moves heat from a low temperature source to a relative high temperature destination. <em>To accomplish this it requires to supply external work</em>.

For any heat pump, the coefficient of performance is a relationship between the heat that is moving to the work that is required to spend doing it<em>.</em>

For a Carnot Heat pump, its coefficient of performance is defined as:

$COP_{HP}=\frac{T_H}{T_H-T_L}$ Where: