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3 years ago

As a woman carries her suitcase up a flight of stairs, she does work against

Physics

1 answer:

Rashid [163]3 years ago

4 0

Answer:

C. 1176 J

Explanation:

12 x 9.8 x 10

Hope it helpss

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A car travels a distance of 200 miles in 3.5 hours in a given trip. What is the average speed of the car in that

erica [24]

Taking into account the definition of speed, the average speed of the car in the trip is 57.14 $\frac{miles}{hour}$ .

<h3>Definition of speed</h3>

Speed is a physical magnitude that relates the displacement of an object and the time it takes to make this change in position.

So, the speed can be defined as the amount of space traveled per unit of time with which a body moves and can be calculated using the expression:

$speed=\frac{displacement}{time}$

Speed has units of $\frac{distance}{time}$ , such as $\frac{meters}{second}$ or $\frac{miles}{hour}$ .

<h3>Average speed of the car</h3>

In this case, you know that:

displacement= 200 miles
time= 3.5 hours

Replacing in the definition of speed:

$speed=\frac{200 miles}{3.5 hours}$

<u><em>speed= 57.14 </em></u> $\frac{miles}{hour}$

Finally, the average speed of the car in the trip is 57.14 $\frac{miles}{hour}$ .

Learn more about velocity:

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brainly.com/question/24990123

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#SPJ1

7 0

2 years ago

Which statements about electric field lines are correct? Check all that apply.

slava [35]

Answer:

they cross over one another between charge.

7 0

4 years ago

A 10-μF capacitor in an LC circuit made entirely of superconducting materials ( R = 0 Ω ) is charged to 100 μC. Then a supercond

satela [25.4K]

Answer:

Vdc=10V

Explanation:

in a closed loop consisting of a super charged capacitor and an inductor, the super charge capacitor acts as a supply when the loop is closed, at t=0, the emf stored in the capacitor is 10V (q/c); and at that same time Vl= voltage across the inductor or loop too would be 10V,

if the loop remains closed for a longer period, the inductor would absorb energy from the capacitor till it dissipates all charges with itself.

8 0

3 years ago

An astronaut on the moon throws a baseball upward. the astronaut is 6ft, 6 in. tall and the initial velocity of the ball is 30 f

Ainat [17]

The equation is garbled and the question is missing.

I found this equation for the same statement:

S = - 2.7t ^2 + 30t + 6.5

And one question is: after how many seconds is the ball 12 feet above the moon's surface?

Given that S is the height of the ball, you just have to replace S with 12 and solve for t.

=> 12 = - 2.7 t^2 + 30t + 6.5

=> 2.7t^2 - 30t - 6.5 + 12 = 0

=> 2.7t^2 - 30t + 5.5 = 0

Now you can use the quadratic equation fo find t:

t = { 30 +/- √ [30^2) - 4(2.7)(5.5)] } / (2*2.7)

=> t = 0.186s and t = 10.925 s

Answer: after 0.186 s the ball is at 12 feet over the surface, and again 10.925 s

5 0

3 years ago

Read 2 more answers

What do we mean by a penetrative pass in the game of football?

Ivanshal [37]

Answer:

Penetration means forward passes can go through the opposition lines. Once these penetrative passes get through each line, it eliminates the line of players it broke through and leaves the player in possession closer to the opposition goal.

Explanation:

6 0

3 years ago