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4 years ago

What tools use cut wood

Physics

1 answer:

Dafna11 [192]4 years ago

3 0

Answer:

hand saws

power saws

Circular Saw

Explanation:

that is all that i know

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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

4. A massless spring hangs from the ceiling, and a mass is hung from the bottom of it. The mass is supported

MrRissso [65]

Answer:

The correct option is C: 0.31 s.

Explanation:

When the mass is then suddenly released we have:

$F = k\Delta y$

Where:

F is the force

k: is the spring constant

Δy: is the spring displacement

Since the tension in the spring is zero, the force is the weight:

$F = mg$

Where:

m is the mass of the object

g is the gravity

$mg = k\Delta y$ (1)

The oscillation period of the spring is given by:

$T = 2\pi \sqrt{\frac{m}{k}}$ (2)

By solving equation (1) for "k" and entering into equation (2) we have:

$T = 2\pi \sqrt{\frac{m}{\frac{mg}{\Delta y}}}$

$T = 2\pi \sqrt{\frac{\Delta y}{g}}$

Since the spring will osclliates in a position between the initial position (when it is at rest) and the final position (when the mass is released and reaches the bottom), we have Δy = 2.5 cm = 0.025 m:

$T = 2\pi \sqrt{\frac{0.025 m}{10 m/s^{2}}} = 0.31 s$

Hence, the oscillation period is 0.31 s.

The correct option is C: 0.31s.

I hope it helps you!

7 0

3 years ago

In an emergency situation, firemen need to respond as quickly as possible. If a fireman is responding from the second floor, how

rjkz [21]

Answer:

4m/s

Explanation:

May be different considering how long the pole is and how heavy the firefighter is.

8 0

3 years ago

f a metal ball suspended by a rod is at rest, which force is responsible for balancing the force due to gravity?

Tamiku [17]

Tension in the rod is responsible for balancing force due to gravity.

6 0

3 years ago

Explain the purpose of a three-valve manifold in closed tank level measurement installations.

mamaluj [8]

Answer:

A three valve manifold serves to protect the capsule from being exposed to pressures above the acceptable range and also enables transmitter isolation from the loop of the process

In closed tank level measurement installations the pressure of the gas if presence of gas on top of the liquid will need to be taken account by the use of a reference connection from the level transmitter to the tank top. The valve used in pressure equalization is kept close when the process system is operating normally.

In the event that the transmitter is removed or put into service, it is necessary to ensure that the gas phase which is at the higher pressure is does not over-range the Differential Pressure DP capsule

Explanation:

7 0

3 years ago