A car speeds up from rest to +16 m/ s in 4s. calculate the acceleration

Answers

Answer 1
Answer:
The magnitude of acceleration is (change in speed) / (time for the change).

Change in speed = (speed at the end) - (speed at the beginning) =

                                   (16 m/s)  -  (0)  =  16 m/s .

Time for the change  =  4 s .

Magnitude of acceleration = (16 m/s) / (4 s) = 4 m/s per sec = 4 m/s² .


Answer 2
Answer: 16 m/s - 0 m/s divided by 4s
= 16 m/s divided by 4s
= 4 m/s
The acceleration is 4 m/s squared

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Suppose the mass of a certain liquid is 35 g. You place it in a beaker that has a mass of 75 g. What is the mass of the liquid? plz help.

Answers

If you are looking for the mass of the liquid with the beaker, you just have to add the beaker mass and liquid mass

35+75= 110 g

Final answer:

The mass of the liquid remains at 35 g regardless of its location or what it's placed inside.

Explanation:

The mass of a liquid is simply the amount of matter it contains, and it does not change regardless of where or in what you place it. So, if the mass of a certain liquid is given as 35 g, this mass value remains unchanged whether you place it in a beaker, cup, or any other container. Therefore, the mass of the liquid in the beaker is still 35 g, and the mass of the beaker doesn't affect it.

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two plane mirrors are at right angles to each other. a man stands between them and combs his hair with his right hand. in how many of the images will he be seen using his right hand? none 1 2 3

Answers

Explanation:

In the first two images the comb would be in the left hand of the man. The image which appears in between those two images has the comb in its right hand. Therefore, the images in which he will be seen using his right hand is one.

A printer has a power of 100 W. It takes 30 seconds to print out a document. How much energy will ithave used?

Answers

A printer has power of 100 W, and it takes time of 30 seconds to print out the document, then the power consumed in 30 seconds will be 0.8333 W.

What is Power?

The quantity of energy moved or changed per unit of time is termed as power in physics. The watt, or one joule per second, is the unit of power in the International System of Units. Power is also referred to as activity in historical texts. A scalar quantity is power.

Power is connected to other factors; for instance, the power required to move a land vehicle is equivalent to the sum of the vehicle's velocity, traction force on its wheels, and aerodynamic drag.

Assuming the printer consumes electrical energy at a steady rate, then:

100 ÷ 60 = 1.6667 watts per minute.

Now, calculate the power consumed in 30 seconds,

1.6667 ÷ 2 = 0.8333 watts.

Therefore, the power consumed in 30 seconds will be 0.8333 watts.

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100W translates to 100 watts consumed in 1 hour. Assuming the printer consumes electrical energy at a steady rate, then: 100 ÷ 60 = 1.6667 watts per minute. 1.6667 ÷ 2 = 0.8333 watts consumed in 30 seconds.

A basketball rolls of a 0.70 m high desk and strikes the floor 0.25 m away from the base of the desk? How fast was the ball rolling?

Answers

0.7/0.25=2.8m per second

For safety concerning a curve, you shouldA. Decelerate before the curve
B. Accelerate before entering the curve
C. Applying the brakes only after exiting the curve
D. Apply the accelerator throughout the entire curve

Answers

Correct answer choice is:

A) Decelerate before the curve.


Explanation:

Decrease your speed before overtaking a curve. Watch out for road symbols signaling of nearing curves so that you have enough time to reduce down before driving through the curve. It is desirable to drive below the posted speed limit as you progress and drive through curves. Turn as little as probable.

For safety concerning a curve, the correct answer is:

A. Decelerate before the curve.

How to take caution on curves

When approaching a curve while driving, it is essential to slow down or decelerate before entering the curve. This allows you to maintain better control of the vehicle and reduce the risk of losing traction or skidding.

By reducing your speed before entering the curve, you can handle the curve more safely and smoothly, adjusting your steering and maintaining stability throughout the turn. Accelerating into a curve or applying the brakes only after exiting the curve can lead to unsafe driving conditions and increase the likelihood of accidents. It is always safer to slow down before taking a curve to ensure a safer driving experience.

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Could anyone explain how to size of an image works in a pinhole camera?

Answers

An image of an object can be used to determine the object's size or the distance to the object. The ability of the human eye's lens to focus an image on the retina is aided by the eye's pupil (the eye's aperture), which acts as a pinhole camera.