1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
padilas [110]
3 years ago
12

A motorist travels at 270 km in p hours at a certain average speed. an expression for the distance that this motorist travelled

in x hours at the same average speed is what
Physics
1 answer:
wel3 years ago
5 0
Average speed = total distance / time ⇒ total distance = average speed *  time

Average speed = 270 km / p hours
distance = d
hours = x

d = 270/p * x
You might be interested in
When a parachutist jumps from an airplane, he eventually reaches a constant speed, called the terminal speed. Once he has reache
Masteriza [31]

Answer:

b) True.    the force of air drag on him is equal to his weight.

Explanation:

Let us propose the solution of the problem in order to analyze the given statements.

The problem must be solved with Newton's second law.

When he jumps off the plane

     fr - w = ma

Where the friction force has some form of type.

     fr = G v + H v²

Let's replace

     (G v + H v²) - mg = m dv / dt

We can see that the friction force increases as the speed increases

At the equilibrium point

      fr - w = 0

      fr = mg

      (G v + H v2) = mg

For low speeds the quadratic depended is not important, so we can reduce the equation to

     G v = mg

     v = mg / G

This is the terminal speed.

Now let's analyze the claims

a) False is g between the friction force constant

b) True.

c) False. It is equal to the weight

d) False. In the terminal speed the acceleration is zero

e) False. The friction force is equal to the weight

3 0
3 years ago
Which of the the following distance vs time graphs represents an object the is moving at constant non zero velocity
mario62 [17]
A graph with a horizontal line
8 0
3 years ago
A 25 kg child is riding on a swing. If the child travels 8.9 m/s at the bottom of their swing, how high into the air is the chil
Setler [38]

Answer:

h = 4.04 m

Explanation:

Given that,

Mass of a child, m = 25 kg

The speed of the child at the bottom of the swing is 8.9 m/s

We need to find the height in the air is the child is able to swing. Let the height is h. Using the conservation of energy such that,

mgh=\dfrac{1}{2}mv^2\\\\h=\dfrac{v^2}{2g}

Put all the values,

h=\dfrac{(8.9)^2}{2\times 9.8}\\\\h=4.04\ m

So, the child is able to go at a height of 4.04 m.

7 0
2 years ago
Write about the similarities and differences between kinetic and potential energy. Include specific, real world example in your
lord [1]

Answer:

Energy is transformed from potential to kinetic and vice versa

Explanation:

The energy is transformed from mechanical to kinetic energy when the object changes its position with respect to a reference point, where it loses height but increases its speed. When the object is at maximum height with respect to a reference point, it will have its maximum potential energy value. When the object passes through the reference point it will have potential energy equal to zero, but this energy will become kinetic energy.

The most characteristic and real example is that of a pendulum at one end, as can be seen in the attached image.

When the pendulum is located at the top end, as shown in Figure 1, at that point the maximum potential energy will be held. Then the pendulum is released and when it passes through the reference point and its height is zero, with respect to that point, all potential energy will have become kinetic energy in the same way at this point the maximum speed of the pendulum will be set.

8 0
3 years ago
Which of the following is a good thermal insulator?*<br> Iron<br> Styrofoam<br> Silver<br> Graphite
Goryan [66]

Answer: graphite

Explanation:

7 0
3 years ago
Read 2 more answers
Other questions:
  • The number of electrons in a copper penny is approximately 10*10^23. How large would the force be on an object if it carried thi
    13·2 answers
  • Describe a sea-level transgression
    6·1 answer
  • A 6 kg block initially at rest is pulled to East along a horizontal surface with coefficient of kinetic friction μk=0.15 by a co
    5·1 answer
  • The light bulb transfers electrical energy into light. What is one type of energy that is also generated that is NOT a desired e
    11·2 answers
  • Sound waves move the most slowly through
    9·2 answers
  • Swimming is a great way to improve cardiovascular/respiratory health.
    7·1 answer
  • A horse pulls on a carriage. By Newton's third law, the carriage pulls back on the horse with equal force. Why do the action and
    5·1 answer
  • A rock falls off a cliff with an acceleration of -9.8 m/s^2 and hits the ground 5 s later . How high is the diff?​
    5·1 answer
  • What mass has a rest energy of 100J?
    10·1 answer
  • Question 2: In 2-4 sentences, explain what would happen to the cell if the nucleus didn’t work?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!