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3 years ago

Which of the following is NOT an illuminated object?

Physics

1 answer:

Korolek [52]3 years ago

5 0

Answer:

The answer here would be light bulb.

Explanation:

An Illuminated object is simply something that reflects light. And everything in the list is illuminated except the light bulb. Humans reflect light in the same way as desks and sidewalks. If we didn't we wouldn't technically be able to see other humans unless they were luminous. This brings me to the nest point. A light bulb is a luminous object because <em>it creates light on its own. </em>

A good example would be this:

The Sun is a luminous object

The Moon is a illuminated object

I hope this helped and didn't confuse you more, I kind of went all over the place with the explanation. Either way, if you need more help feel free to let me know! :)

-Matt

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A punter drops a 2.0 kg ball from rest vertically 1 meter down onto his foot. The ball leaves the foot with a speed of 18 m/s at

pav-90 [236]

Answer:

Explanation:

Given

mass of drop $m=2 kg$

height of fall $h=1 m$

ball leaves the foot with a speed of 18 m/s at an angle of $55^{\circ}$

Velocity of ball just before the collision with the floor

$u^=2gh$

$u=\sqrt{2gh}$

$u=\sqrt{2\times 9.8\times 1}=4.42 m/s$

Impulse delivered in Y direction

$J_y=m(v\sin (55)-(-u))$

$J_y=2(18\sin (55)+4.42)$

$J_y=38.32 kg-m/s$

Impulse in x direction

$J_x=m\times v\cos (55)$

$J_x=2\times 4.42\cos (55)=20.646$

$J_{net}=\sqrt{J_x^2+J_y^2}$

$J_{net}=\sqrt{(38.32)^2+(20.64)^2}$

$J_{net}=43.52 kg-m/s$

at an angle of $\tan \phi =\frac{J_y}{J_x}=\frac{38.32}{20.64}$

$\phi =tan^{-1}(1.856)$

$\phi =61.7^{\circ}$

7 0

3 years ago

What is the derivative of x^2 - x + 3 at the point x = 5?

Hunter-Best [27]

Answer:

Explanation:

d/dx (x² - x + 3)

= 2x - 1

when x = 5,

2x-1

= 2(5) - 1

= 10 - 1

= 9

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3 years ago

How much time does it take to roll a ball 2 meters on a steep slope

11111nata11111 [884]

Answer:

asdadsadada

Explanation:

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3 years ago

A ball rolls onto the path of your car as you drive down a quiet neighborhood street. to avoid hitting the child that runs to re

KengaRu [80]

Since the acceleration of car is uniform so the distance traveled by car while brakes are applied is given by

$d = \frac{v_f + v_i}{2}*t$

given that

$v_f = 9 m/s$

$v_i = 15 m/s$

$t = 1.20 s$

now plug in all data in above formula

$d = \frac{15 + 9}{2} * 1.2$

$d = 14.4 m$

so car will cover 14.4 m distance while it apply brakes

5 0

4 years ago

A 100-cm long dipole is excited by a sinusoidally varying current with an amplitude i0=2 a. Determine the time average power rad

Mnenie [13.5K]

For A 100-cm long dipole is excited by a sinusoidally varying current with an amplitude i0=2 , the time average power radiated is mathematically given as

P=0.1577w

<h3>What is the time average power radiated by the dipole if the oscillating frequency is 150 mhz?</h3>

Generally, the equation for the is mathematically given as

$\lambda =\frac{c}{f}$

Therefore

$\lambda=\frac{3\times 10^{8}}{10^{6}}$

lambda=300m

In conclusion, for the power

$P=40\pi^{2}(I_{0})^{2}(\frac{l}{\lambda})^{2}\\\\P=40* (3.14)^{2}\times6^{2} (\frac{1}{300})^{2}$

P=0.1577w