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3 years ago

Two passengers are on a moving sidewalk at the airport. Passenger A is

Physics

1 answer:

Oksanka [162]3 years ago

8 0

Answer:

V = - 2[m/s]

Explanation:

This is a classic problem of relative velocities, in order to solve it we must understand each of the velocities, given in the initial data of the problem.

VA = velocity of passenger A, = 1.5[km/h], it is the same velocity of the sidewalk

VB = 2 + 1.5 = 3.5 [km/h], that is the velocity observed by a person outside from the sidewalk.

And from the perspective of passenger B the speed of passanger A is:

VA-VB = - 2 [m/s]

It means that the passenger B is seen how passenger A is getting close to him and then passed.

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After hitting a long fly ball that goes over the right fielder's head and lands in the outfield, the batter decides to keep goin

jarptica [38.1K]

Answer:

a) 633.39 J

b) 0.28

Explanation:

a)The kinetic energy of the player = $\frac{1}{2} mv^{2}$

Work done by friction = energy change of the player

= $\frac{1}{2} 67(4.35)^{2}$ = 633.9 J

b) Assuming the frictional force stays constant,

Work done by friction = Frictional force×distance

Frictional force = kinetic friction(μ)×normal reaction

Normal reaction = weight = mass×gravitational acceleration ( g=10m/s2 )

Combining these equations

633.9 = F×3.4 ⇒ F = 186.44 N

F = μmg ⇒ μ = F/mg

= 186.44/670

= 0.28

5 0

3 years ago

"The work done on an ideal gas system in an isothermal process is -400 J. What is the change in internal (thermal) energy of the

Archy [21]

Answer:

zero

Explanation:

Work done = - 400 J

In an isothermal process, the temperature remains constant. So, according to the first law of thermodynamics

dQ = dU + dW

As the temperature remains constant and the change in internal energy is the function of change in temperature, here change is temperature is zero so the change in internal energy is also zero.

6 0

3 years ago

A car traveling west at 70 miles per hour for 3 hours covers a distance of

gtnhenbr [62]

70x3=210 mph... its that easy

5 0

3 years ago

The light reactions of photosynthesis supply the calvin cycle with __________.

Margaret [11]

Answer:

ATP and NADPH

Explanation:

4 0

2 years ago

A measure of the body's resting energy expenditure based on data that is collected four hours after eating or physical activity

Monica [59]

Electricity. I took something like this hope this helps :)

4 0

3 years ago