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3 years ago

20 points!

Physics

1 answer:

MariettaO [177]3 years ago

8 0

Do they give answer choices? or is it free write? i’ll help if you tell me!!

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Sunlight, with an intensity of 667 W / m², strikes a flat collecting surface perpendicularly and is totally absorbed. The area o

alexandr1967 [171]

Answer:

F = 20.07 μN

Explanation:

given,

intensity of sunlight = 667 W/m²

area of surface = 9.03 m²

speed of light = 3 x 10⁸ m/s

force = ?

we know

force = $intensity \times \dfrac{Area}{speed of light}$

force = $667 \times \dfrac{9.03}{3\times 10^8}$

F = 20.07 x 10⁻⁶ N

F = 20.07 μN

6 0

4 years ago

If a truck is heading south at a velocity of 90m/s for 10 seconds how far did it travel?

RoseWind [281]

Answer:

Truck will be at a distance of 720 m

Explanation:

Speed of the truck is given as 90 m/sec

Time for which truck travel t = 10 seconds

We have to find the distance that how much truck travel in 8 sec with speed of 90 m/sec

We know that distance is given by $distance=velocity\times time$

So distance traveled by truck in 8 sec will be equal to $=90\times 8 =720m$

So truck will be at a distance of 720 m

3 0

4 years ago

What is physical change

taurus [48]

Answer:

Physical changes are changes affecting the form of a chemical substance

Explanation:

8 0

2 years ago

Read 2 more answers

Differences between music and noise

Vika [28.1K]

Answer:

Music is a sound that produces a pleasing sensation. It is produced by nature, musical instruments, human voice, etc. Noise is an unwanted and unpleasant sound produced by horns of vehicles, by machines, etc. If a musical sound is made too loud, it becomes a noise.

Hope This Helps!

Have a Nice Day!

3 0

3 years ago

A stone is thrown vertically upward with a speed of 15.0 m/s from the edge of a cliff 75.0 m high.How much later does it reach t

Katarina [22]

Answer:

5.72 seconds

848.27 m/s

97.94 m

Explanation:

t = Time taken

u = Initial velocity = 15 m/s

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 9.81 m/s²

$v=u+at\\\Rightarrow 0=15-9.81\times t\\\Rightarrow \frac{-15}{-9.81}=t\\\Rightarrow t=1.52 \s$

Time taken to reach maximum height is 0.97 seconds

$s=ut+\frac{1}{2}at^2\\\Rightarrow s=15\times 1.52+\frac{1}{2}\times -9.81\times 1.52^2\\\Rightarrow s=11.47\ m$

So, the stone would travel 11.47 m up

So, total height stone would fall is 75+11.47 = 86.47 m

Total distance travelled by the stone would be 75+11.47+11.47 = 97.94 m

$s=ut+\frac{1}{2}at^2\\\Rightarrow 86.47=0t+\frac{1}{2}\times 9.8\times t^2\\\Rightarrow t=\sqrt{\frac{86.47\times 2}{9.81}}\\\Rightarrow t=4.2\ s$

Time taken by the stone to travel 86.47 m to the water is is 4.2 seconds

The stone reaches the water after 4.2+1.52 = 5.72 seconds after throwing the stone

$v=u+at\\\Rightarrow v=0+9.81\times 86.47 = 848.27\ m/s$

Speed just before hitting the water is 848.27 m/s

3 0

3 years ago