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9 months ago

I was told it was 5.886 J by another tutor on here but that was incorrect so just trying again

Physics

1 answer:

Sauron [17]9 months ago

7 0

The potential energy of gravity is given by:

$\begin{gathered} E=mgh \\ where: \\ m=0.3 \\ h=2 \\ g=9.8 \\ so: \\ E=0.3\cdot2\cdot9.8 \\ E\approx5.9J \end{gathered}$

Answer:

5.9 J

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The driver of a car slams on the brakes, causing the car to slow down at a rate of 17ft/s2 as the car skids 285ft to a stop.

ozzi

1) 5.79 s

2) 98.4 ft/s

Explanation:

The motion of the car is a uniformly accelerated motion (it means it travels with constant acceleration), so we can find the time it takes for the car to stop by using the following suvat equation:

$s=vt-\frac{1}{2}at^2$

where

s is the distance travelled

v is the final velocity

t is the time

a is the acceleration of the car

In this problem we have:

s = 285 ft is the distance travelled

$a=-17 ft/s^2$ is the acceleration of the car (negative since the car is slowing down)

v = 0 ft/s is the final velocity of the car, since it comes to a stop

Solving for t, we find:

$t=\sqrt{\frac{-2s}{a}}=\sqrt{\frac{-2(285)}{-17}}=5.79 s$

The initial speed of the car can be found by using another suvat equation, namely:

$v=u+at$

where

v is the final speed

u is the initial speed

a is the acceleration

t is the time

In this problem, we have:

v = 0 is the final speed of the car

$a=-17 ft/s^2$ is the acceleration of the car (negative since the car is slowing down)

t = 5.79 s is the total time of motion (found in part 1)

Therefore, the initial speed of the car is:

$u=v-at=0-(-17)(5.79)=98.4 ft/s$

8 0

3 years ago

The upward and downward movement of air in the atmosphere creates pressure systems. Arrange the steps in the correct order to de

OleMash [197]

Answer:

Cool, dense air begins to sink downward.
A high-pressure system forms.
Pressure differences cause wind to blow outward.
The skies clear, making way for pleasant weather.

Explanation:

The air near the land warms up and rises. Cool dense air sinks being heavier. This creates a pressure difference. A high pressure system forms. This difference leads to blowing of wind from High pressure to low pressure area. Eventually sky gets clear and we experience pleasant weather. Hence, the correct order to describe this is:

Cool, dense air begins to sink downward.
A high-pressure system forms.
Pressure differences cause wind to blow outward.
The skies clear, making way for pleasant weather.

4 0

2 years ago

Read 2 more answers

A bicycle has tires of radius 0.35 meters. If the bicycle is traveling at a constant speed of 7.8 m/s, at approximately what ang

lord [1]

22.3 rad/s

<h3>Further explanation</h3>

We will solve the question of uniform circular motion.

<u>Given:</u>

A bicycle has tires of radius $\boxed{ \ R = 0.35 \ meters \ }$
The bicycle is traveling at a constant speed of $\boxed{ \ v = 7.8 \ m/s \ }$

<u>Question:</u>

What angular speed are the tires rotating?

<u>The Process:</u>

Speed, angular speed, and radius are connected in the following formula:

$\boxed{\boxed{ \ v = \omega R \ }}$

The angular speed is worked out by

$\boxed{ \ \omega = \frac{v}{R} \ }$

All units are in the SI system so let us calculate the angular speed.

$\boxed{ \ \omega = \frac{7.8 \ m/s}{0.35 \ m} \ }$

Thus the value of the angular velocity of the rotating tire is $\boxed{\boxed{ \ \omega = 22.3 \ rad/s \ }}$

<u>An additional question:</u>

What is the frequency of tire rotation?

Recall this formula: $\boxed{ \ \omega = 2 \pi f \ } \rightarrow \boxed{ \ f = \frac{\omega}{2 \pi} \ }$

$\boxed{ \ f = \frac{22.3 \ rad/s}{2 \pi} \ }$

We get $\boxed{\boxed{ \ f = 3.55 \ Hz \ }}$

<h3>Learn more</h3>

Arc CD is ²/₃ of the circumference of a circle. What is the radian measure of the central angle? brainly.com/question/2115496
A triangle is rotated 90° about the origin brainly.com/question/2992432
Particle's speed and direction of motion brainly.com/question/2814900

Keywords: a bicycle has tires of radius 0.35 meters. traveling, at a constant speed of 7.8 m/s, at approximately, angular speed, the tires rotating