All categories

3 years ago

Please see attached.

Physics

1 answer:

Elden [556K]3 years ago

5 0

Answer:

Explanation:

The speed is increasing and he was stationary which means the acceleration is not 0

You might be interested in

If you view a complete free body diagram of a moving object, what two apects of the body's motion will the diagram show?

aliya0001 [1]

In a completed free body diagram, the diagram should show the magnitude and direction of the body's motion.

5 0

3 years ago

RACTIC PTUDIES

Amanda [17]

Answer:

The illumination on the book before the lamp is moved is 9 times the illumination after the lamp is moved.

Explanation:

The distance of the book before the lamp is moved, $d_{b} = 30 cm$

The distance of the book after the lamp is moved, $d_{a} = 90 cm$

Illumination can be given by the formula, $E = \frac{P}{4 \pi d^{2} }$

Illumination before the lamp is moved, $E_{b} = \frac{P}{4 \pi d_{b} ^{2} }$

Illumination after the lamp is moved, $E_{a} = \frac{P}{4 \pi d_{a} ^{2} }$

$\frac{E_{a}}{E_{b}} } = \frac{\frac{P}{4 \pi d_{a} ^{2} } }{\frac{P}{4 \pi d_{b} ^{2} } }$

$\frac{E_{a} }{E_{b} } = \frac{d_{b} ^{2} }{d_{a} ^{2}} \\\frac{E_{a} }{E_{b} } = \frac{30^{2} }{90 ^{2}}\\\frac{E_{a} }{E_{b} } =\frac{900 }{8100}\\\frac{E_{a} }{E_{b} } =\frac{1 }{9}$

$E_{b} = 9E_{a}$

The illumination on the book before the lamp is moved is 9 times the illumination after the lamp is moved.

6 0

3 years ago

How much kinetic energy would a 65 kg person required to escape from the earth's gravitational field

stellarik [79]

The kinetic energy needed by the man is $4.5\cdot 10^9 J$

Explanation:

The escape velocity (the speed needed by an object in the Earth's surface to escape the Earth's gravitational field) is given by

$v=\sqrt{\frac{2GM}{R}}$

where

G is the gravitational constant

M is the Earth's mass

R is the radius of the Earth

For the Earth, we have

$M=5.97\cdot 10^{24} kg$

$R=6.37\cdot 10^6 m$

Substituting, we find the escape velocity:

$v=\sqrt{\frac{2(6.67\cdot 10^{-11})(5.97\cdot 10^{24})}{6.37\cdot 10^6}}=1.18\cdot 10^4 m/s$

Now we can find the kinetic energy that the man would need, which is given by

$K=\frac{1}{2}mv^2$

where

m = 65 kg is the mass of the person

$v=1.18\cdot 10^4 m/s$ is the escape velocity

Substituting,

$K=\frac{1}{2}(65)(1.18\cdot 10^4)^2=4.5\cdot 10^9 J$

Learn more about kinetic energy:

brainly.com/question/6536722

#LearnwithBrainly

3 0

3 years ago

The energy that generates wind comes from what source?

mamaluj [8]

The energy that generates wind on an individual basis originates with
one's habitual diet. On a world-wide basis, it comes from the sun.

6 0

3 years ago

What is the definition of efficent

nika2105 [10]

Efficient: the measure of how much energy is used in a process.

8 0

3 years ago