A racecar is equipped with a computer that records the reading on its speedometer every second during a race. If you graph this data, what will be the best choice for the dependent variable?

Answers

Answer 1

Answer: Since the device is a speedometer, the data it read is the speed of the racecar. Data recording involving time usually uses time as the independent variable. It was also said in the problem that it records the speed every second which shows that the time interval is constant. This means that only other data, the car's speed, is the dependent variable.

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The Coriolis effect is the result of which of the following? A. winds spinning off the equator B. the rotation of the earth on its axis C. the different air movements north and south of the equator D. the friction that slows down winds near the earth’s surface

Answers

The answer is B. the rotation of the earth on its axis.

Coriolis effect is the effect of the Earth's rotation on theoceans and atmosphere. It is the cause of deflection to the right in thenorthern hemisphere and to the left in the southern hemisphere. Thus, in thenorthern hemisphere, gyres spin clockwise, and in the southern hemisphere, gyres spin counter-clockwise.

Answer:

B. the rotation of Earth on its axis

Explanation:

K12

(d) You observe someone pulling a block of mass 41 kg across a low-friction surface. While they pull a distance of 4 m in the direction of motion, the speed of the block changes from 5 m/s to 7 m/s. Calculate the magnitude of the force exerted by the person on the block.

Answers

Answer:

The magnitude of the force is 124.23 N.

Explanation:

To known the magnitude of the force is necessary to find the acceleration, that can be done by means of the equations for a a Uniformly Accelerated Motion:

$v_(f) = v_(i) + at$ (1)

Where $v_(f)$ is the final velocity, $v_(i)$ is the initial velocity, a is the acceleration and t is the time.

$a = (v_(f)-v_(i))/(t)$ (2)

$d = v_(i)t + (1)/(2)at^(2)$ (3)

By replacing (2) in equation (3) it is gotten:

$d = v_(i)t + (1)/(2)((v_(f)-v_(i))/(t))t^(2)$

$d = v_(i)t + (1)/(2)(v_(f)-v_(i))t$

$d = v_(i)t + (1)/(2)v_(f)t-(1)/(2)v_(i)t$

Therefore, by subtracting the first and third term ( $v_(i)t-(1)/(2)v_(i)t$ ⇒ $(1)/(2)v_(i)t$ ) it is got:

$d = (1)/(2)v_(f)t + (1)/(2)v_(i)t$

Applying common factor for $(1)/(2)t$ :

$d = (1)/(2)(v_(f) + v_(i))t$ (4)

Equation (4) can be rewritten in terms of t:

$t = (2d)/((v_(f) + v_(i)))$

$t = ((2)(4m))/((7m/s + 5m/s))$

$t = (8m)/(12m/s)$

$t = 0.66s$

By knowing the time is possible to determine the acceleration by means of equation (2):

$a = (7m/s-5m/s)/(0.66s)$

$a = (2m/s)/(0.66s)$

$a = 3.03m/s^(2)$

The magnitude of the force exerted by the person on the block can be determine by means of Newton's second law:

$F = ma$ (5)

$F = (41Kg)(3.03m/s^(2))$

$F = 124.23 Kg.m/s^(2)$

$F = 124.23 N$

Hence, the magnitude of the force is 124.23 N.

The potential of electrons in a circuit can be increased by _____. flowing through the conducting wires
the action of a battery
passing through a circuit element
water pressure

Answers

Answer: The potential of electrons in a circuit can be increased by the action of the battery.

Explanation:

A battery is a source of energy. It provides push to voltage so that the current can flow in the circuit.

For example, the electrical energy is used by the bulb connected in the circuit. The electrical energy is provided by the battery. If the energy of the battery is used up then no current will flow in the circuit. Then the bulb will not glow in this case.

Therefore, the potential of electrons in a circuit can be increased by the action of the battery.

The potential of electrons in a circuit can be increased by the action of a battery.

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How do scientific tests help determine the properties of substances

Answers

It can help determine substances that appear similar but react differently under the same circumstances.

The Earth has a radius of 6,400 kilometers. A satellite orbits the Earth at a distance of 12,800 kilometers from the center of the Earth. If the weight of the satellite on Earth is 100 kilonewtons, the gravitational force on the satellite in orbit is?It would be great if you could add a few words of explanation.

Answers

By using a universal gravitational force, we can get that $F_(g) = (G. m_(1) . m_(2))/( r^(2) )$ .

For note : r is a distance from center of the earth to the object.

Then, if $r_(1)$ is 6.400 km, and if $r_(2)$ is 12.800 km,
we can say that $r_(2)$ is $2r_(1)$

In first equation we can say that :
$F_(g) = (G.m_(1) m_(2) )/( r_(1)^(2) ) = 100.000 N$

then in second equation we can say that :
$F_(g) = (G.m_(1) m_(2) )/( r_(2)^(2) )$ ,
$F_(g) = (G.m_(1) m_(2) )/( (2r_(1))^(2) )$ (because $r_(2)$ is $2r_(1)$ )
$F_(g) = (G.m_(1) m_(2) )/( 4r_(1)^(2) )$ ,
we can say that : $F_(g) = (1)/(4) (G.m_(1) m_(2) )/( r_(1)^(2) )$
so, by plugging first equation into second equation, we can get
$F_(g) = (1)/(4) (G.m_(1) m_(2) )/( r_(1)^(2) ) = (1)/(4) . 100.000 N = 25.000 N$

A boy pushes on a wagon so that it accelerates at a rate of 0.50 m/s2. The wagon has a mass of 24 kg. What is the magnitude of the boy's pushing force? (Ignore frictional effects.) 12 N, 12 kg, 48 N, or 48 kg

Answers

The magnitude of the boy's pushing force is equal to 12 N. Therefore, option A is correct.

What is force?

Force acting on a system can be described as the effect that can change the state of the body of motion or rest. The SI measurement unit of force is Newton (N) and force can be described as a vector quantity. Force can change the direction or the speed of the moving object.

The force can be evaluated from the multiplication of the mass (m) with acceleration (a) of an object. The mathematical second law of motion can be used for force:

F = ma

Given, the rate of acceleration of a wagon, a = 0.50 m/s²

The mass of the wagon, m = 24 kg

The magnitude of the boy's pushing force can be calculated as:

F = 0.50 ×24

F = 12 N

Therefore, the magnitude of the pushing force applied by the boy is equal to 12 N.

Learn more about force, here:

brainly.com/question/13191643

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The correct answer is 12N

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