PHYSICS HIGH SCHOOL

A person 4ft tall casts a shadow 10ft long. at the same time, a nearby tree casts a shadow 23 ft long. find the height of the tree

Answers

Answer 1
Answer: 9 feet and some inches

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What fuels could you use to create a fire? Also, why would it be useful to light a fire if you were shipwrecked. Thank you very much ♥ ☺

Answers

You could use wood, leaves, twigs, or branches. You could also use stones to make or start a fire by rubbing them together. It would be useful if you were shipwrecked because someone might see your fire then and see that you needed help. It could also keep you warm. 

How far can a bus travel in 8 h at an average speed of 60 mph?

Answers

Answer:

480 mph

Explanation:

speed = 60 mph

time = 8 hours

distance = speed*time

             = 60*8

             = 480 mph

The weight of an object on a planet depends not only on its mass, but also on its distance from the planets center. Uranus has more than 14 times as much mass as earth, yet the gravitational force is less. Explain how this could be. Pleas answer cause idk what it means.

Answers

The further an object is from the centre of a planet, the lower it's gravitational force. Uranus had 14 times as much mass as earth, but it's also a lot bigger than earth. So assuming an object is on the surface of Uranus, it would be really far away from the centre of Uranus, therefore the gravitational force is less.

Hope this helps!
weight w=m*g
where m is the mass and g the gravitational acceleration.
Uranus has much more mass than Earth though it has less gravitational force than Earth.

You're taking your first dive in ALVIN (Fig 10.13) to witness a hot spot on the ocean floor. As you descend and arrive on site, what are your first impressions?

Answers

Answer:

Explanation:

The experience is magnanimous and wonderful when witnessing the hotspot site. It was a great feeling! I could witness the red hot lava oozing out to the ocean floor from the subsurface like water from a hot-spring, and immediately, a cooling effect occurs. At that current time, the gas was coming up in the form of gas bubbles. I believed there was a mini-volcano located inside the ocean! The scene was fascinating, just like inserting a red-hot metallic-iron ball into the cool water, thereby creating a fizzing of gas and the ball's immediate cooling. It was a remarkable experience of witnessing an underwater volcano with the erupting lava and its immediate cooling to form a solid material.

While watching a recent science fiction movie, one Klingon spaceship blows up a Droid spaceship with a laser gun. The Klingon crew watches out the port window and covers their ears to muffle the noise from the explosion. Scientifically, this scene is inaccurate becauseA) light can not reflect off objects in the vacuum of space.
B) they would not be able to see anything outside the window.
C) lasers can not be transmitted through the vacuum of space.
D) the sound of the explosion would not be transmitted back to their ship.

Answers

Scientifically this scene is inaccurate because the sound of the explosion would not be transmitted back to their ship. The correct option among all the options that are given in the question is the last option or option "D". As sound cannot travel through a vacuum, so it is not possible for the crew to hear the sound of explosion.

Answer:

D. the sound of the explosion would not be transmitted back to their ship.

Explanation:

Sound is a type of mechanical wave so it needs a solid to move through. Since space is a vacuum, the Klingon crew would not be able to hear the explosion.

A constant net torque is applied to a rotating object. Which of the following best describes the object's motion?a. The object will rotate with increasing angular acceleration.
b. The object will have a decreasing moment of inertia.
c. The object will rotate with constant angular velocity.
d. The object will have an increasing moment of inertia.
e. The object will rotate with decreasing angular acceleration.
f. The object will rotate with constant angular acceleration.

Answers

Answer:

f. The object will rotate with constant angular acceleration.

Explanation:

We know that

τ = I α

τ=Torque

I=Moment of inertia of the object

α =Angular acceleration

The moment of inertia is constant for an object and it does not depends on the applied torque.

If applied torque is constant then the angular acceleration of the object will be constant because moment of inertia is constant.

If angular speed is constant then the angular acceleration will,be zero.But in this case object is having angular acceleration that is why it have varying angular speed.

Therefore option "f" is correct.
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