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2 years ago

Which choice best explains the definition of a variable?

Physics

1 answer:

Alexandra [31]2 years ago

5 0

Answer:

I don't have the answer but...

Explanation:

A variable is a quantity that may change within the context of a mathematical problem or experiment. Typically, we use a single letter to represent a variable. The letters x, y, and z are common generic symbols used for variables.

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What is the binding energy of Helium atom if its mass is 4.002603 u?

Zanzabum

Here it is. It was too much to type on a phone....

4 0

2 years ago

Two students are balancing on a 10m seesaw. The seesaw is designed so that each side of the seesaw is 5m long. The student on th

monitta

Answer:

x = 4 m

Explanation:

For this exercise we must use the rotational equilibrium relationship, where we place zero at the turning point and counterclockwise rotations we will consider positive

as it indicates that the bar is in equilibrium, its center of mass coincides with the turning point, so the distance is zero and does not create torque on the system

∑τ = 0

W 3 - w x = 0

x = 3W / w

x = 3 Mg / mg

x = 3 M / m

let's calculate

x = 3 60/45

x = 4 m

7 0

2 years ago

7. A roller coaster’s velocity at the top of a hill is 10 m/s. Two seconds later it reaches the bottom ofthe hill with a velocit

zheka24 [161]

Answer:

7) $a=8m/s^2$

8) $a=-5m/s^2$

9) $a=-1.5m/s^2$

10) $v=29.4m/s$

Explanation:

For the problems 7, 8 and 9 we just apply the definition of acceleration, since no more information is given, which is:

$a=\frac{\Delta v}{\Delta t}=\frac{v_f-v_i}{t_f-t_i}$

So for each problem we will have:

7) $a=\frac{26m/s-10m/s}{2s}=8m/s^2$

8) $a=\frac{10m/s-25m/s}{3s}=-5m/s^2$

9) $a=\frac{0m/s-15m/s}{10s}=-1.5m/s^2$

For the problem 10, we use the equation of velocity in accelerated motion:

$v=v_0+at$

Since the ball starts from rest and the acceleration is that of gravity (we take the downward direction positive), we have:

$v=(0m/s)+(9.8m/s)(3s)=29.4m/s$

5 0

2 years ago

Technician A says that if starter drive clearance is too small, the starter will produce a noise during cranking. Technician B s

Ronch [10]

Answer:

Both Technicians A and B are wrong in there answers.

Explanation:

Starter Drives are rotating mechanical component use to drive another component (flywheel) to start an engine. And thus they are known as starters. Starters are smaller than the component they drive. They are found commonly in automobiles.

The starter and the driven component(gear) are supposed to fit closely, with some clearance between the two gears so as to operate without noise. When the clearance is too small there will be a noise after cranking, and when the clearance is too great there be noise before cranking.

Cranking simply means starting an engine or the initial rotating of an engine to start it.

8 0

3 years ago

On the image at right, the two magnets are the same. Which paper clip would be harder to remove?

serious [3.7K]

Answer:B

Explanation: The book is thinner making magnets attraction stronger, making the paper clip harder to move

7 0

2 years ago