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3 years ago

Mechanical energy is a term that is used to describe

Physics

2 answers:

kolezko [41]3 years ago

5 0

Answer: B

both potential and kinetic

Rudiy273 years ago

3 0

Answer is B. both potential and kinetic energy.

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You may have noticed runaway truck lanes while driving in the mountains. These gravel-filled lanes are designed to stop trucks t

Sladkaya [172]

Answer:

0.767

Explanation:

The work done on the truck by the frictional drag force is given by

$W=-Fd$

where

F is the magnitude of the frictional force

d = 38.0 m is the maximum displacement allowed for the truck

The negative sign is due to the fact that the force of friction is opposite to the motion of the truck

The force of friction can also be written as:

$F=\mu mg$

where

$\mu$ is the coefficient of kinetic friction between the truck and the lane

m is the mass of the truck

g is the acceleration of gravity

So we can rewrite the work done as

$W=-\mu mg d$ (1)

According to the work-energy theorem, the work done by friction is equal to the change in kinetic energy of the truck:

$W=K_f - K_i = \frac{1}{2}mv^2-\frac{1}{2}mu^2$ (2)

where

v = 0 is the final velocity of the truck

u = 23.9 m/s is the initial velocity of the truck

By combining (1) and (2) we get

$-\frac{1}{2}mu^2 = -\mu mg d$

And solving for $\mu$ , we find the minimum coefficient of kinetic friction able to stop the truck in a distance d:

$\mu = \frac{u^2}{2gd}=\frac{23.9^2}{2(9.8)(38.0)}=0.767$

7 0

3 years ago

Some machines do not multiply the force that is applied to them

Katyanochek1 [597]

Answer:

Machine Efficiency

Explanation:

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work). The output work is always less than the input work because some of the input work is used to overcome friction. Therefore, efficiency is always less than 100 percent

5 0

3 years ago

Do all planets orbit the sun in the same direction

horsena [70]

Answer:

Explanation:

All planets are different than others and bigger so that means no

8 0

3 years ago

Explain the law of conservation of energy in your own words .

melamori03 [73]

The law of conservation of energy states that in any reaction, energy cannot be created or destroyed.

In other words, energy has to be conserved in every reaction.

4 0

3 years ago

How high would a 75 kg hiker have to climb to increase her potention by 12000 J

LekaFEV [45]

16.33m

Explanation:

Given parameters:

Mass of the hiker = 75kg

Potential energy = 12000J

Unknown:

Height = ?

Solution:

The potential energy is the energy at rest of a body.

Potential energy = mgh

m is the mass of the hiker

g is the acceleration due to gravity

h is the height

The unknown is the height;

Height = $\frac{Potential energy}{mg}$

Height = $\frac{12000}{75 x 9.8}$ = 16.33m

Learn more:

Potential energy brainly.com/question/10770261

#learnwithBrainly

5 0

3 years ago