help pls someone quick ​

Answer:

21. A box is at rest at the top of a frictionless inclined plane. As the box slides down the ramp where along the ramp would the box have half of its orginial potential energy?

Halfway down the ramp

When it is at half of its maximum velocity

When it is at half of its total trip time

Answer:

AnSwEr iS BeLoW

Explanation:

Well according to https://van.physics.

The headlamp's concave mirror is open on one end, and the light bulb's filament is placed at or near the focus. Parallel ight rays, if they were coming into the headlamp from outside (say, the driver is driving his car in the direction of the setting sun), would converge near the filament of the light bulb

Hopes this helps :)

When a light bulb is placed at focus , the head lamp as a concave mirror will produce a narrow beam.

Concave mirror is the spherical part of mirror which is painted from outside and the ray falling on this mirror forms a real image.

The concave mirror of headlamp is open on one end, and the bulb filament is placed at the focus. Parallel ight rays from outside will converge to form a narrow beam near the filament of the light bulb.

Thus, When a light bulb is placed at focus , the head lamp as a concave mirror will produce a narrow beam.

Learn more about concave mirror.

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Given that Jennifer is walking at 1.63 m/s and her weight is 583 N.  Therefore, the magnitude of her momentum is 96.97 Kg•m/s

m = W / g

m = 583 / 9.8

m = 59.49 Kg

Momentum = mass × velocity

Momentum = 59.49 × 1.63

Momentum = 96.97 Kg•m/s

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Answer: The answer is both. Cloud-to-ground lightning comes from the sky down, but the part you see comes from the ground up. A typical cloud-to-ground flash lowers a path of negative electricity (that we cannot see) towards the ground in a series of spurts.

Explanation:

Answer:

16.6 N

Explanation:

m = 0.52 kg, v₀ = 0, v = 8.6 m/s, t = 0.27 s

a = (v - v₀)/t

F = ma = m(v - v₀)/t = 0.52 (8.6 - 0)/0.27 = 16.6 N

Answer:

B.105

Explanation:

Non-zero digits are always significant.

Zeros between significant digits are also significant.

Trailing zeros are significant only after a decimal point.

0.015 has 2 significant figures.

105 has 3 significant figures.

150 has 2 significant figures.

1.050 has 4 significant figures.

When the mass of the cart changes, the time to travel at 4.6 m/s is 28.11 s.

The acceleration of mule is calculated as follows;

a = v/t

a = 5/10

a = 0.5 m/s²

F1 = F2

m₁v₁/t₁ = m₂v₂/t₂

(180 x 5) / 10 = (550 x 4.6)/t

90 = 2530/t

t = 2530/90

t = 28.11 s

Thus, when the mass of the cart changes, the time to travel at 4.6 m/s is 28.11 s.

Learn more about acceleration here: https://brainly.com/question/14344386

Answer:

c

Explanation:because its the correct one

Answer:

1.pulley,screw,inclined plane

2.using simple machine properly with right way and precautions

Explanation:

3.cuz if they are not used properly they can cause injuries to organs

The first user who answer is correct :)

The rotational speed of the person is 0.4 rad/s.

The rotational speed of the person in radian per second is calculated as follows;

v = ωr

where;

ω = v/r

ω = 2/5

ω = 0.4 rad/s

Thus, the rotational speed of the person is 0.4 rad/s.

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Answer:

9.8 cm

Explanation:

x = natural length

k*[(12 - x)² - (10 - x)²]/2 = 6            (1)

k*[(14 - x)² - (12 - x)²]/2 = 6 + 10     (2)

(1): k(144 + x² - 24x - 100 - x² + 20x) = 12

k(44 - 4x) = 12,

divide by 4, k(11 - x) = 3, k = 3/(11 - x)

(2): k(196 + x² - 28x - 144 - x² + 24x) = 32

k(52 - 4x) = 32

divide by 4, k(13 - x) = 8

3/(11 - x) * (13 - x) = 8

3(13 - x) = 8(11 - x)

39 - 3x = 88 - 8x

5x = 49

x = 9.8 cm

Answer:

metal B

temperature flow from high region to low . metal B has more temperature than others

The change in surface area of Gaussian surface with radius (r) is 8πr.

The electric field experienced by a charge is calculated as follows;

[tex]E = \frac{Q}{4\pi \varepsilon_o r^2}[/tex]

where;

The electric field reduces by a factor of [tex]\frac{1}{r^2}[/tex]

The surface area of a sphere is given as;

[tex]A = 4\pi r^2[/tex]

[tex]\frac{dA}{dr} = 8\pi r[/tex]

Thus, the change in surface area of Gaussian surface with radius (r) is 8πr.

Learn more about area of Gaussian surfaces here: https://brainly.com/question/17060446

Answer:

If you shine a beam of light (a bundle of parallel rays) through the air, it will travel in a straight line. Rays of light usually travel in straight lines until they hit something. If a ray of light hits the surface of a sheet of glass, some light will be reflected by the surface of the glass.

Explanation:

STREAM LALISA AND MONEY

The magnetic field at the center of the circular loop is 3.24 x 10⁻⁴ T.

The current in the wire is calculated as follows;

V = IR

I = V/R

I = 16.7/0.251

I = 66.53 A

The magnetic field at the center of the circular loop is calculated as follows;

[tex]B = \frac{\mu_0 I}{2R} \\\\B = \frac{4\pi \times 10^{-7} \times66.53 }{2\times 0.129} \\\\B = 3.24 \times 10^{-4} \ T[/tex]

Learn more about magnetic field here: https://brainly.com/question/7802337

It's very wonderful to help you today!

Answer:

The resistance of the wire after being heated is approximately 1.15 times the resistance before being heated.

Explanation:

The resistance of the wire goes up as the temperature goes up.

By Ohm's law, we have the relationship between the resistance of a conductor R, the current flowing through it, I, and the voltage across it, V,

[tex]V=R~x~I[/tex]

As described, the current through the wire decreases so, to maintain the same voltage, the resistance must increase when the wire is heated. Let's say R1 is the resistance before heating the wire and R2 is the resistance after,

[tex]V=R_{1} x~I_{1} =R_{2}~} x~I_{2}[/tex]

Let's solve for R2,

[tex]R_{2} =\frac{I_{1} }{I_{2} }~x~R_{1}[/tex]

In this case, I1 = 0.3A and I2 = 0.26A,

[tex]R_{2} =\frac{0.3A}{0.26A} ~x~R_{1} =1.15R_{1}[/tex]

Hence, the resistance of the wire after being heated is approximately 1.15 times the resistance before being heated.

Answer:

Earth rotates on its axis from west to east approximately every 24 hours

Explanation:

hope this helps :)

Answer:

lunch box, cotton, toilet paper, and the foam peanuts

Explanation:

bc I did this experiment in 3rd grade =w="

Hope this helped! Have a nice day!

Please give brainliest when possible!

:3

Answer:

Wave speed is the distance a wave travels in a given amount of time, such as the number of meters it travels per second. Wave speed is related to wavelength and wave frequency by the equation: Speed = Wavelength x Frequency. This equation can be used to calculate wave speed when wavelength and frequency are known.

Answer:

v = νλ

Explanation:

Let these be the denoted symbols for the values :-

Frequency = ν

Wavelength = λ

Speed = v

=> Then the relation is :

=> v = νλ

Answer and Explanation:

I can't write the essay for you, but I can give you useful tips on what information should be in your essay.

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Outdoor skills basically have a similar concept to street smarts. With street smarts, you are knowledgeable in what to do on the streets, how to act, what signs and signals to look out for, and other things like that. With outside smarts, it's the same way. Except, I would say that it is a little less social.

Outside smarts could be something like camping, and surviving in general in the wild, such as:

- Creating a tent or shelter for yourself to sleep in.

- Finding food and knowing whether it is acceptable and safe to eat.

- Making sure that you are in a safe area that is okay for you to camp out in.

- Making sure that you have some sort of protection, whether that would be with a weapon, a tool, or something else.

- Making sure that you have safe water to drink that you brought with you.

- A back-up plan in case there is a reason that you need to leave.

- A first aid kit in case of injury.

- How to create a fire and use it safely.

- A way to get back home, with a plan and possibly even a compass.

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I hope that this helps.

Answer:  ~Y/n here~ Your answer I believe would be:

A. kinetic energy before the collision equals kinetic energy after the collision.

(Hope this helps!)

Answer:

Work transfers energy

Explanation:

Work can affect energy by transfering energy between objects to result to a change in the amount and form of energy

Answer:External forces are forces caused by external agent outside of the system. Internal forces are forces exchanged by the objects in the system.

Explanation:or our purposes, we will simply say that external forces include the applied force, normal force, tension force, friction force, and air resistance force. And for our purposes, the internal forces include the gravity forces, magnetic force, electrical force, and spring force.HOPE THIS HELPS!!! ^w^

Answer:

sorry really need points thanks tho

Answer:

Not sure what how to how to how to how means but if you tell me what you need id be happy to help

Answer:

The industry standard life span is about 25 to 30 years, and that means that some panels installed at the early end of the current boom aren't long from being retired is the operating life time of a PV module .

Answer:

28 m

Explanation:

v₀ = 23.4 m/s, g = -9.8 m/s²

at the peak v = 0

find h

v² - v₀² = 2gh

0 - 23.4² = 2(-9.8)h = -19.6 h

so h = 28 m

Answer: In vision, the ventral stream controls identification of an object, and the dorsal stream controls action toward the object.

Explanation: The ventral stream is associated with object recognition and form representation.

Dorsal stream  a pathway that carries visual information from the primary visual cortex to the parietal lobe.

Hope it helps :)