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dmitriy555 [2]
3 years ago
6

Knowing the definition of work as used by physicists, how can the work done on an object be equal to zero? a. The force and dist

ance are perpendicular. b. The force is zero. c. The distance is zero. d. all of these e. none of these.
Physics
1 answer:
Nuetrik [128]3 years ago
4 0

Answer:

C

Explanation:

Work is the product of force and distance moved in the direction of force . if no distance, no work is done. Holding a heavy object still means no work is done

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About 65 million years ago an asteroid struck Earth in the area of the Yucatán Peninsula and wiped out the dinosaurs and many ot
9966 [12]

Answer:

2.44156\times 10^{13}\ m^3

29010.53917 m

Explanation:

\rho = Density of asteroid = 2 g/cm³

V = Volume

d = Diameter = 10 km

r = Radius = \dfrac{d}{2}=\dfrac{10}{2}=5\ km

v = Velocity = 11 km/s

H_v = Heat vaporization of water = 2.26\times 10^6\ J/kg

\Delta T = Change in temperature = 100-20

Mass is given by

m=\rho V\\\Rightarrow m=\rho\dfrac{4}{3}\pi r^3\\\Rightarrow m=2000\dfrac{4}{3}\times \pi\times 5000^3\\\Rightarrow m=1.0472\times 10^{15}\ kg

The kinetic energy is

K=\dfrac{1}{2}mv^2\\\Rightarrow K=\dfrac{1}{2}1.0472\times 10^{15}\times 11000^2\\\Rightarrow K=6.33556\times 10^{22}\ J

Heat is given by

Q=mc\Delta T+mH_v\\\Rightarrow 6.33556\times 10^{22}=m\times (4186\times (100-20)+2.26\times 10^6)\\\Rightarrow m=\dfrac{ 6.33556\times 10^{22}}{4186\times (100-20)+2.26\times 10^6}\\\Rightarrow m=2.44156\times 10^{16}\ kg

Mass of water is 2.44156\times 10^{16}\ kg

Volume is \dfrac{2.44156\times 10^{16}}{10^3}=2.44156\times 10^{13}\ m^3

Amount of water is 2.44156\times 10^{13}\ m^3

If it were a cube

h=V^{\dfrac{1}{3}}\\\Rightarrow h=(2.44156\times 10^{13})^{\dfrac{1}{3}}\\\Rightarrow h=29010.53917\ m

The height of the water would be 29010.53917 m

4 0
2 years ago
How much work must be done on a 20-kg go-cart to increase its speed from 5 m/s to 10 m/s?
allochka39001 [22]

b 250 j

hope  this helps                            

6 0
2 years ago
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HELP ASAP PLSSSSSSS!!!!! The scientific method often begins by asking questions about the natural world. Which of the following
grin007 [14]

Answer:

A)How does fertilizer affect plant growth

Explanation:

there are some effects of different fertilizer on plants

1 is providing multi-nutrition

2 soil amelioration

3 increasing production

4 slow release.

7 0
3 years ago
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Which lists the main components of Darwin’s theory of evolution?
Nataliya [291]

Hi!


The correct option is B.


<h3>Explanation</h3>

Evolution is a biological phenomena which descries how the heritable characteristics of a species change over successive generations. These characteristics change as a result of a mutation, natural selection or genetic recombination (to list a few).

Darwin's theory of evolution explained how this phenomena occurs with respect to natural selection. The theory goes on to explain how a species diverges from a common ancestor into two or more different species (meaning different species may have common ancestor). This is a slow process as it can take thousands of years.


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2 years ago
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What is the slope of this blue line
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Gradient of the line is m =-2/5

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