1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Kay [80]
3 years ago
12

(12)

Physics
1 answer:
noname [10]3 years ago
4 0

Answer:

Power is the rate at which work is done or energy is transferred in a unit of time. Power is increased if work is done faster or energy is transferred in less time.

You might be interested in
What kind of air mass comes from the Gulf of Mexico? A. continental tropical B. continental polar C. maritime tropical D. mariti
Yakvenalex [24]
A. Hope this helps! (:
8 0
3 years ago
Read 2 more answers
If a 54 kg sprinter can accelerate from a standing start to a speed of 10 m/s in 3 s, what average power is generated?
lora16 [44]

Answer:

Power, P = 600 watts

Explanation:

It is given that,

Mass of sprinter, m = 54 kg

Speed, v = 10 m/s

Time taken, t = 3 s

We need to find the average power generated. The work done divided by time taken is called power generated by the sprinter i.e.

P=\dfrac{W}{t}

Work done is equal to the change in kinetic energy of the sprinter.

P=\dfrac{\dfrac{1}{2}mv^2}{t}

P=\dfrac{\dfrac{1}{2}\times 54\ kg\times (10\ m/s)^2}{3\ s}

P = 900 watts

So, the average power generated by the sprinter is 900 watts. Hence, this is the required solution.

3 0
3 years ago
Leoni is participating in four drawing competitions. If the probability of her losing any
Alex17521 [72]

Answer:

(a) Probability = 0.7599

(b) Probability = 0.2646

Explanation:

Represent losing with L and winning with W.

So:

L = 0.7 --- Given

n = 4

Probability of winning would be:

W = 1 - L

W = 1 - 0.7

W = 0.3

The question illustrates binomial probability and will be solved using the following binomial expansion;

(L + W)^4 = L^4 + 4L^3W + 6L^2W^2 + 4LW^3 + W^4

So:

Solving (a): Winning at least 1

We look at the above and we list out the terms where the powers of W is at least 1; i.e., 1,2,3 and 4

So, we have:

Probability = 4L^3W + 6L^2W^2 + 4LW^3 + W^4

Substitute value for W and L

Probability = 4 * 0.7^3*0.3 + 6*0.7^2*0.3^2 + 4*0.7*0.3^3 + 0.3^4

Probability = 0.7599

<em>Hence, the probability of her winning at least one is 0.7599</em>

Solving (a): Wining exactly 2

We look at the above and we list out the terms where the powers of W is exactly 2

So, we have:

Probability = 6L^2W^2

Substitute value for W and L

Probability = 6*0.7^2*0.3^2

Probability = 0.2646

<em>Hence, the probability of her winning exactly two is 0.2646</em>

6 0
2 years ago
Identify the particle that is NOT a subatomic particle.
Lyrx [107]
The answer is c, positron.
5 0
2 years ago
If you lie on the ground at night with no cover, you get cold rather quickly. Much of this is due to energy loss by radiation. A
marin [14]

Answer:

301.48 J/s

Explanation:

We are given;

Temperature of the sky dropping to −40∘C: T_o = -40°C = -40 + 273 = 233 K

Temperature of your skin and clothes: T = 30°C = 30 + 273 = 303 K

Body surface area of human body is around 2 m². But here only half of the body is facing the sky, Thus Area is: A = 2/2 = 1 m²

To solve this, we will use the equation for thermal heat transfer known as the Stefan bolt Mann equation.

ΔQ/Δt = εσA(T⁴ - (T_o)⁴)

Where;

ΔQ/Δt is the rate at which you body loses energy by radiation

ε is the emissivity of the human body with a value of 0.97

σ is Stefan boltzmann constant with a value of 5.67 X 10^(-8) W/m².K⁴

Thus;

ΔQ/Δt = 0.97 × 5.67 X 10^(-8) × 1(303⁴ - 233⁴)

ΔQ/Δt = 301.48 J/s

7 0
3 years ago
Other questions:
  • Jim Abbott was drafted ________ overall in the first round of the 1989 draft.
    6·2 answers
  • What magnetically happens when there is an electric current in a wire?​
    12·2 answers
  • What does this equation mean FeDe=FrDr
    7·1 answer
  • What is the center of our solar system?
    15·1 answer
  • Find the speed of light in each of the following materials. (a) gallium phosphide m/s (b) carbon disulfide m/s (c) benzene
    11·1 answer
  • Express the volume expansivity and the isothermal compressibility as functions of density rho and its partial derivatives. For w
    6·1 answer
  • The terminal speed of a sky diver is 163 km/h in the spread-eagle position and 325 km/h in the nosedive position. Assuming that
    7·1 answer
  • A car with a mass of 1,400 kg is traveling at a speed of 40 m/s. What is its momentum?
    5·1 answer
  • B. A car is moving 4.0 m/s to the right. The car begins to accelerate at a rate of 1.5 m/s/s, to the right. After
    10·1 answer
  • Two sound waves (wave X and wave Y) are moving through a medium at the same speed. If wave X has a greater frequency than wave Y
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!