A car traveling in a straight line has a velocity of 3.79 m/s at some instant. After 5.4 s, its velocity is 11.9 m/s. What is its average acceleration in this time interval? Answer in units of m/s 2

Answers

Answer 1
Answer:
|Acceleration| = (change in speed) / (time for the change)

Change in speed = (speed at the end) minus (speed at the beginning).

Change in speed = (11.9 m/s  -  3.79 m/s)  =  8.11 m/s

|Acceleration| = (8.11 m/s) / (5.4 sec) = 1.502 m/s² (rounded)

This solution is written in terms of speed and the absolute value
of acceleration.  The question gives no information regarding the
direction of motion at any time, so it's not possible to say anything
about velocity, or the direction of acceleration.


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Maria’s father started a fire in the fireplace. He crumpled some paper, lit a match, and soon the logs in the fireplace were burning. In this case, the stored chemical energy in the logs was changed intoA) electrical energy.
B) mechanical motion.
C) heat and light energy.
D) electrical and heat energy.

Answers

As per the question the crumpled paper was burnt .

When the paper was burnt,it produces light.One also feels the sensation of heat.

The electrical energy is due to the flow of electrons. Here no electronic motion takes place.Hence no electrical energy will be produced.

Mechanical energy is the sum total of kinetic and potential energy.The kinetic energy is the energy gained due to the motion of the body and potential energy is the energy gained due to the position or configuration of the body.

Hence from above,we can get that the correct answer to the question is-C] Heat and light energy.

It was changed into heat and light energy.

A person of mass 80 kg stands on Earth's surface. What is his weight?

Answers


  Weight is always (mass) times (gravity in the place where you are).

On Earth, acceleration due to gravity is  9.8 m/s² ,
so the person's weight is

                       (80 kg) x (9.8 m/s²) = 784 newtons .

                                              (about  176.4 pounds)

The answer is 784 newtons. I hope that helps you :]

Two physics students, Ben and Bonnie, are in the weightlifting room. Bonnie lifts the 50 kg barbell over her head (approximately .60 m) 10 times in one minute; Ben lifts the 50 kg barbell the same distance over his head 10 times in 10 seconds. Which student does the most work? Which student delivers the most power? Explain your answers.

Answers

Final answer:

Both students do the same amount of work, but Ben delivers more power due to completing the work in a shorter time.

Explanation:

In this case, both Ben and Bonnie are lifting the same 50 kg barbell over their heads, but they are doing it at different rates. Bonnie lifts the barbell 10 times in one minute, which means she is doing the work over a longer period of time. Ben, on the other hand, lifts the barbell 10 times in 10 seconds, doing the work in a shorter amount of time.

The amount of work done is equal to the force exerted multiplied by the distance moved. Since the mass and distance are the same for both students, the work done is equal. However, power is defined as the rate at which work is done, which is calculated by dividing the work done by the time taken to do it. Since Ben completes the work in a shorter period of time, he delivers more power than Bonnie.

Therefore, Ben does the most work and delivers the most power.

Learn more about Work and Power here:

brainly.com/question/3854047

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Answer:

Both of them

Explanation:

Objects in a composition occupy ____________.a. negative space
c. symbolic form
b. the forefront
d. positive space

Answers

Answer:

D. Positive space

Step-by-step explanation:

We are given that,

'Objects in a composition occupy ___'.

We know that,

In a composition the space occupied by the given object is known as the positive space, whereas any space around the object is known as the negative space.

So, we get that,

Objects in a composition occupy positive space.

Thus, option D is correct.

Objects in composition occupy a positive space.

Question #4 Multiple Choice Which of the following is a similarity between an industrial metrologist and a legal metrologist? Both are employed by private companies Both ensure confidence in the quality of measurements Both ensure adequate functioning of measurement instruments Both develop measurement standards based on research​

Answers

Answer:

choice B

Explanation:i took the test

Answer:

ITS D

Explanation:

if its wrong i will comeback and re do it

Two technicians are discussing testing MAP sensors. Technician A says that the MAP sensor should be replaced if anything comes out of the sensor when the vacuum hose is removed from the sensor. Technician B says that the injector pulse width should increase when vacuum to the MAP sensor is increased. Which technician is correct?a.Technician A onlyb.Technician B onlyc.Both Technicians A and Bd.Neither Technician A nor B

Answers

The statements from both Technicians A and B are correct.

Answer: Option C

Explanation:

A typical MAP sensors comprises with a ceramic or silicon wafers, sealed with an ideal vacuum on one side and a suction manifold on the other. When the engine (motor) vacuum varies, the differential pressure across the board changes the output voltage or frequency to the MAP sensor. So, sensor vacuum to be increased if injection pulse widths increase.

Most pressure sensors operate at 5 volts from a computer and return a signal (voltage or frequency) based on the pressure applied to the sensor (vacuum). When testing the MAP sensor, make sure that the vacuum hose and hose connections are tightly connected to the engine vacuum source. According to this, concluding that the statements from both technicians are correct.