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3 years ago

I will mark you brainlist please help

Physics

1 answer:

denis-greek [22]3 years ago

8 0

Answer:15th

Explanation:

I believe it will fall on the 15th stair because 10 times 15 is 150 divided by 10 m/s equals 15

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You've recently read about a chemical laser that generates a 20.0-cm-diameter, 22.0 MW laser beam. One day, after physics class,

Setler [38]

Answer:

0.3847 m/s

Explanation:

$I$ = Intensity = $\dfrac{P}{A}=\dfrac{P}{\pi r^2}$

d = Diameter = 20 cm

r = Radius = $\dfrac{d}{2}=\dfrac{20}{2}=10\ cm$

c = Speed of light = $3\times 10^8\ m/s$

s = Distance = 100 m

P = Power = 22 MW

Pressure due to the laser is given by

$P_r=\dfrac{I}{c}\\\Rightarrow P_r=\dfrac{P}{Ac}\\\Rightarrow P_r=\dfrac{P}{\pi r^2c}\\\Rightarrow P_r=\dfrac{22\times 10^{6}}{\pi 0.1^2\times 3\times 10^8}\\\Rightarrow P_r=2.33427\ N/m^2$

Force is given by

$F=P_rA\\\Rightarrow F=2.33427\times \pi 0.1^2\\\Rightarrow F=0.07333\ N$

Acceleration is given by

$a=\dfrac{F}{m}\\\Rightarrow a=\dfrac{0.07333}{99}\\\Rightarrow a=0.00074\ m/s^2$

Speed of the block would be

$v=\sqrt{2as}\\\Rightarrow v=\sqrt{2\times 0.00074\times 100}\\\Rightarrow v=0.3847\ m/s$

The speed of the block is 0.3847 m/s

5 0

3 years ago

/Q: DHSMV definition/ i have to write 20 characters for whatever reason lol

cluponka [151]

Department of Highway Safety and Motor Vehicles OR

Division of Highway Safety and Motor Vehicles

6 0

4 years ago

In a simple electric circuit, a 110-volt electric heater

Readme [11.4K]

Answer: 55 ohms

Explanation:

Given that,

Voltage of heater (v) = 110-volt

Current drawn by heater (I) = 2.0 amperes

resistance of the heater (r) = ?

Since voltage, current and resistance are involved, apply the formula for ohms law.

Voltage = current x resistance

i.e v = ir

where r = v / i

r = 110 volts / 2.0 A

r = 55 ohms

Thus, the resistance of the heater is 55 ohms

6 0

3 years ago

I really need help with this!! Will give brainliest if you help T^T

slava [35]

Answer:

What inferences can you make about the melting points of the different substances and the motion of their particles, based on the data? (ignore that needed it here so i could see it better.)

Explanation:

Butter has a lower melting point than the cheese and the wax. The motion of the cheese were a little separated while the butter articles have more space in between. The wax had the closest particles.

I dont know if that makes sense?

5 0

3 years ago

An object was dropped from the plane with 1000 km above the ground with a mass of 300 kg. Find the acceleration of the object ea

Oxana [17]

Answer:

$9.8m/s^2$

Explanation:

The acceleration due to gravity on earth is $9.8m/s^2$ regardless of the mass of the object. This means, in the absence of air resistance, both a 3000 kg object and a 300 kg will accelerate at the same rate of $9.8m/s^2$ towards earth.

The reason the acceleration due to gravity is the same for all masses is that by grace of nature, the inertial mass $m$ of the object from $F= ma$ equals the gravitational mass $m$ from $F =G \dfrac{mM}{R^2}$ , resulting

$ma=G\dfrac{mM}{R^2}$

$\boxed{a=G\dfrac{M}{R^2}}$

which is the acceleration that only depends on the mass of earth and its radius, and not on the mass of the object.

8 0

4 years ago