Lena is playing with a remote-controlled car in her backyard. She knows that the car uses a wheel and axle to move. What is the primary source of power for the wheel and axle in the remote-controlled car?

A.
friction between the ground and the tires

B.
radio waves from the remote control

C.
chemical energy from the batteries

D.
potential energy with the car sitting at the top of a small hill

Answer:

Please find the answer in the explanation

Explanation:

Friction is a force that opposes motion. One or two of the advantages of friction are break and ability of an object to walk.

Writing yes it is useful because when your writing because friction helps you see what your writing

ii. Rubbing. Yes, it is useful.

friction make it possible for two object to rub each other

iii. Skiing. No. It is not useful because With presence of friction, skiing will not be possible.

iv. Rotating a wheel No. It is not useful because Friction will oppose the rotation of the wheel.

Answer:

The height is 1.20 m above the window.

Explanation:

Given that,

Height of window = 1.10 m

Time = 0.190 sec

We need to calculate the velocity

Using equation of motion

[tex]s=ut+\dfrac{1}{2}gt^2[/tex]

Put the value into the formula

[tex]1.10=u\times0.190+\dfrac{1}{2}\times9.8\times(0.190)^2[/tex]

[tex]1.10=u\times0.190+0.17689[/tex]

[tex]u=\dfrac{1.10-0.17689}{0.190}[/tex]

[tex]u=4.85\ m/s[/tex]

We need to calculate the height

Using equation of motion

[tex]v^2=u^2+2gh[/tex]

Put the value into the formula

[tex](4.85)^2=0+2\times9.8\times h[/tex]

[tex]h=\dfrac{(4.85)^2}{2\times9.8}[/tex]

[tex]h=1.20\ m[/tex]

Hence, The height is 1.20 m above the window.

Answer:

HOW NEWTON'S LAWS RELATE TO REAL WORLD LIFE EXPERIENCE

Newton's law are very important because they tie into almost everything we see in everyday life. These laws tell us exactly how things move or sit still, like why you don't float out of bed or fall through the floor of your house. Newton's laws control how cars work, how water flows, how buildings don't fall down, and basically how everything around us moves.

EXAMPLE OF NEWTON'S LAW:

° First Law: Inertia

°Second Law: Force and Acceleration

°Third Law: Action and Reaction

HOW NEWTON'S LAW RELATE TO REAL LIFE EXPERIENCE

FIRST LAW (INERTIA) :

If you throw a rock straight up, it will not vary from its direction. Inertia enables ice skaters to glide on the ice in a straight line. If the wind is blowing, a tree's branches are moving. A piece of ripe fruit that falls from the tree will fall in the direction the wind is moving because of inertia.

SECOND LAW (FORCE AND ACCELERATION) :

The use of force in our everyday life is very common. We use force to walk on the road, to lift the objects, to throw a cricket ball, or to move a given body by some particular speed or direction. We are very familiar with the various effects of force. We can exert pull and push. And also When the car slows down. When you fall off a bridge. The car turning at the corner is an example of acceleration because the direction is changing. The quicker the turns, the greater the acceleration.

THIRD LAW (ACTION AND REACTION) :

For example, when you jump, your legs apply a force to the ground, and the ground applies and equal and opposite reaction force that propels you into the air. Engineers too apply Newton's third law when designing rockets and other projectile devices.

Answer:

If you are talking about the chemicals...

Explanation:

"Sugar, salt, nitrites, butylated hydroxy anisol (BHA), butylated hydroxyl toluene (BHT), tert-butylhydroquinone (TBHQ), vinegar, citric acid, and calcium propionate are all chemicals that preserve foods. Salt, sodium nitrite, spices, vinegar, and alcohol have been used to preserve foods for centuries."

Hope this is helpful!!

Explanation:

The letter r stands for the radius of the sphere, which is the distance from the center of a sphere to its surface. The radius is exactly half of the diameter , which is the ...

Answer:

You will need to stop at least 20 m before you hit the elk.

Explanation:

Answer:

15mph

Explanation:

Because you've already done distance and time. Speed=distance divided by time. so it would be 300 divided by 20 giving you 15.

Answer:

Energy stored in an object due to its position is Potential Energy. · Energy that a moving object has due to its motion is Kinetic Energy.

Explanation:

Answer:

To summarize, potential energy is the energy that is stored in an object due to its position relative to some zero position.

Holding a bow and arrow before shooting, The amount of energy stored before you race on track, And a roller coaster going to it's highest point staying there waiting to come down.

Answer:C

Explanation:

She used 2 different amounts of salts so that was her mistake she should of used 1

Answer:8

Explanation: 134.4 divided by 16.8

Answer:

Explanation:

The distance covered by an object given it's velocity and time taken can be found by using the formula

From the question

velocity = 4.2 m/s

time = 17 s

We have

distance = 4.2 × 17

We have the final answer as

Hope this helps you

Explanation:

Answer:

The slope of position-time graph is the velocity of the object understudy

Answer:

A.125

Explanation:

Its correct on Schoology.

Answer:

it is a branch of tissue and organs . More it includes airways lungs and blood cells The muscles that power our lungs are also part of respiratory system .These parts work together to inhale oxygen and clean out waste materials(carbon dioxide) from our body .

Answer:

Capsule (endoscopy)

Explanation:

The capsule endoscopy is a procedure whereby a pill containing a micro-camera is swallowed by a diagnostic patient. The capsule conveniently goes through the patient's digestive system tract and takes several thousands of images of the small and large intestines and as it travels through the digestive tract without causing pain or irritation to the patient.

Answer:

The answer is pill-cam.

Explanation:

mechanical energy

Explanation:

its right

Answer:

a

Explanation:

Answer:

B and D

Explanation:

Answer:

324 in ===

Explanation:

Answer:

36 kg

Explanation:

m= ?

KE= 324 J

v= 9 m/s

m= 324 / 9

m= 36 kg

Answer:

0.31429 Amps

Explanation:

Using the "Ohm's Law" we can look for the current (amps) with a formula of I = V/R

Given:

Resistance (Ohm) = 350

Volts = 110

Solution:

I = 110v/350r

I = 0.31429 amps

Answer:

5 bulldogs

Explanation:

you need 4 bulldogs to beat 40 dragons, but since you would still need 3 dragons defeated, you would need another bulldog

Answer:

it took 70.6 meters for the ball to fall

Answer:

a) t=3.6 sec

b) [tex]\mid v \mid =38\ m/s[/tex]

Explanation:

Horizontal Motion

When an object is thrown horizontally with a speed v from a height h, it describes a curved trajectory ruled by a constant speed in the horizontal direction and a variable speed in the vertical direction, where the acceleration of gravity makes the object fall to the ground.

If we know the height h from which the object was launched, the time it takes to hit the ground is:

[tex]\displaystyle t=\sqrt{\frac {2h}{g}}[/tex]

The horizontal speed is always constant:

vx=vo

But the vertical speed depends on the time and acceleration of gravity:

[tex]vy=g\cdot t[/tex]

The magnitude of the velocity or final speed of the object is given by:

[tex]\mid v \mid =\sqrt{vx^2+vy^2}[/tex]

a.

The stone was kicked over the cliff with a speed of v0=14 m/s, and the height it was thrown from is h=63.5 m, thus:

[tex]\displaystyle t=\sqrt{\frac {2\cdot 63.5}{9.8}}[/tex]

t=3.6 sec

b.

The vertical speed is:

[tex]vy=9.8\cdot 3.6[/tex]

vy=35.3 m/s

The final speed is calculated below:

[tex]\mid v \mid =\sqrt{14^2+35.3^2}[/tex]

[tex]\mid v \mid =\sqrt{1,442.09}[/tex]

[tex]\boxed{\mathbf{\mid v \mid =38\ m/s}}[/tex]

Answer:

600 and 1500 [ohm

Explanation:

To solve this problem we must use ohm's law, which tells us that the voltage is the product of the current by the resistance, so we have:

V = I*R

where:

V = voltage [V]

I = current [amp]

R = resistance [ohm]

Therefore:

R = V/I

R1 = 60/(40*10^-3) = 1500 [ohm]

R2 = 60/(100*10^-3) = 600 [ohm]

So the resistance should be among 600 and 1500 [ohm]

Answer:

s = d/t

s = 230/2

s = 115 mph

Explanation:

Average Speed (s) = Distance travelled (d) / Time elapsed (t)