Answer: a graduated cylinder and balance
A rock has an irregular shape. so, it would be difficult to measure using a meter stick. most convenient method to find the volume would be using a graduated cylinder. we can take a fixed volume of water in the cylinder. then drop rock into it. note the new raised volume. Subtract the initial volume from final to find the volume of rock.
Using balance, mass of the rock can be measured.
we can calculate the density using the following formula:
Therefore, we need only two tools, a graduated cylinder and a balance to measure mass, volume and density of a rock.
Answer:No
Explanation:
No
As the train is accelerating so train velocity will be more as compared to the ball and thus will cover more distance as compared to the ball.
When the ball is thrown upward with some velocity, it also possesses the train velocity at the time of throwing but as time passes velocity of train increases due to acceleration of the train. This causes the ball to fall behind the point of launch.
Answer:
<h2>a) positivo.</h2>
Explanation:
The question is
The work done by gravity during a projectile decline is:
a) Positive.
b) Negative.
c) Zero.
d) Depends on y-axis direction.
e) Depends on x-axis direciton.
Remember that Work is defined as the energy needed to move an object. Mathematically, it's the product between the force exerted and the displacement. That means if we don't have any displacement, then there's no work.
In this case, we are talking about the work done by the gravity force. When a projectile goes down, it's because of the gravity force, which means it can't be zero.
Specifically, the work done by gravity is positive, because when the projectile is going down, it's getting closer to the atracttive mass, which is Earth.
Therefore, the right answer is a.
Answer:
Radiation
Explanation:
The heat transfer take place by three modes
1. Conduction
This type of heat transfer take place in the solid materials like metals .This heat transfer take place due to vibration of electron.
2.Convection
This type of heat transfer take place in the moving fluid like water ,air etc.
3.Radiation
Every materials which having temperature above 0 K are emitting radiation.This type of heat transfer dominate at the high temperature.
We know that temperature of sun is so high so the heat transfer from sun to the earth is take place by radiation mainly.
The best explanation is the <em>difference</em> between the inside <em>temperature</em> and the outside temperature.
If the player doesn't change his emboucher (muscles and position of his lips), then the pitch produced by the instrument depends only on the physical dimensions of its plumbing, and the speed of sound in the tube.
BOTH of those things change slightly when the temperature changes.
