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3 years ago

What two controls on a car cause a change in speed? What control causes only a change in velocity

1 answer:

8 0

<span>The brake and gas pedal change speed in a car (brake slows it down, gas pedal speeds it up) and the steering wheel changes the velocity (it changes the direction). </span>

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Discuss what in particular makes the light bulb a non-ohmic resistor. Specifically, how does temperature affect resistance? Can

bagirrra123 [75]

Answer:

the loss of energy due to the Joule effect is the cause of the non-ohmic characteristic of the bulb

Explanation:

A resistance is formed of some type of metal, in a light bulb it is Tungsten, which for low current is a resistance that complies with the ohm law.

When the value of the current is increased the shock of the electors creates a Joule effect, which heats the metal, these shocks are due to atomic imperfections of the structure, this heating creates a loss of energy of the system that causes the characteristic to be lost linear between the voltage and the current, since the total energy balance must be preserved.

An approximate measure of the energy that is emitted is given by Stefan's law.

In short, the loss of energy due to the Joule effect is the cause of the non-ohmic characteristic of the bulb

8 0

2 years ago

A skier with a 65kg mass skies down a 30 degree incline hill. The coefficient of friction is 0.1. a. Draw a free body diagram. b

djyliett [7]

B is the answer! Because no one would be pushing the rock all the way down the hill it would just go down by itself by rolling!!

Hope i helped plz mark as brainlist and 5 star'!

6 0

3 years ago

A spring has a force constant of 500.0 N/m. Show that the potential energy stored in the spring is as follows: a. 0.400 J when t

kogti [31]

Answer:

(a) Hence, the potential energy = 0.400 J.

(b) Hence the potential Energy = 0.225 J.

(c) Hence the potential energy = 0 J

Explanation:

Potential Energy; This is the energy of a body, by virtue of its position in the gravitational field. The unit of potential energy is Joules (J)

the potential energy stored in a spring is

Ep = 1/2ke²..................................... Equation 1

Where Ep = potential Energy, k = force constant, e = extension.

When spring is stretched 4.00 cm, e = 4.00 cm = 4/100 = 0.04 m, and k = 500 N/m.

Substituting into equation 1

Ep = 1/2(500)(0.04)²

Ep = 0.4 J.

Hence, the potential energy = 0.400 J.

(b)

When the spring is compressed 3.00 cm, e = 3.00 cm = 3/100 = 0.03 m, and k = 500 N/m.

Substitute into equation 1,

Ep = 1/2(500)(0.03)²

Ep = 250(0.0009)

Ep = 0.225 J.

Hence the potential Energy = 0.225 J.

Substituting into equation 1

Ep = 1/2(500)(0)²

Ep = 250(0)

Ep = 0.

Hence the potential energy = 0 J

3 0

3 years ago

the human nervous system can propagate nerve impulses at about 10 squared metered per second. estimate the time it takes to trav

rusak2 [61]

Use the formular d = v x t
d = 2m
v= 100m/s

t= d / v
= 2 / 100
= 0.02sec

7 0

3 years ago

Read 2 more answers

Mass (kg) 4.0

densk [106]

Answer:

25 m/s

Explanation:

First of all, we can find the acceleration the object by using Newton's second law of motion:

$F=ma$

where

F = 20.0 N is the net force applied on the object

m = 4.0 kg is the mass of the object

a is its acceleration

Solving for a, we find

$a=\frac{F}{m}=\frac{20}{4}=5.0 m/s^2$

Now we know that the motion of the object is a uniformly accelerated motion, so we can find its final velocity by using the following suvat equation:

$v=u+at$

where

v is the final velocity

u = 0 is the initial velocity

$a=5.0 m/s^2$ is the acceleration

t = 5 s is the time

By substituting,

$v=0+(5.0)(5)=25 m/s$

8 0

2 years ago