Calculate the period of a material point on a circle with a diameter of 20 cm at a speed of 7.2 km/h. a) 5 seconds b) 20 seconds c) 25 seconds d) 50 seconds

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Water pressure in a lake is greater __________. a. at the bottom b. at the surface c. at any point, for pressure is the same d. throughout midway to the bottom

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Answer:

The correct answer a

Explanation:

In the fluid pressure is a measure of force per unit area, in this case force is the weight of the fluid that increases as we descend. Therefore, the pressure increases with the depth of the fluid.

The correct answer a

Answer:

a. at the bottom

Explanation:

Since water at the bottom of the lake is under pressure by all the water molecules above it plus atmospheric pressure. It is no doubt that the pressure at the bottom of the lake is larger than pressure in the middle and at the surface of the lake.

How much energy is contained in matter with mass of 1 gram (0.001 kilogram)

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The mechanical energy consisting of potential and kinetic energy is:

0.001 x [ (acceleration of gravity x height) + (1/2) (speed)² ] .

You want to know how much [ mc² ] there is in 1 gram of mass.

E = m c² = (0.001) x (3 x 10⁸)² = 9 x 10¹³ joules

That's the energy that a 1,000-watt toaster uses
in 2,852 years of continuous toasting.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Hope that helped!

If the mass of one object is tripled, and the distance between them is doubled, how does the force of gravity change?a. force is multiplied by 4
b. Force is divided 3
c. Force is multiplied 3/4
d. Force is divided 3/4

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Force between two object is given by F = Gm1m2/r^2
If the mass of one object is tripled, and the distance between them is doubled,
then F(new) = Gm13m2/(2r)^2 = 3Gm1m2/4r^2 = 3/4 x Gm1m2/r^2 = 3/4 x F
i.e. F(new) = 3/4 multiplied by F.
Therefore, Force is multiplied by 3/4.

Nicolaus Copernicus believed that the: sun revolved around the earth sun was the center of the solar system movement of planets could explain weather stars and planets represented spirits

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Nicolaus Copernicus spearheaded the idea of heliocentrism, that is, that the sun was the center of the solar system. Back in his time, a lot of astronomers and scientists believed that the earth was the center of the solar system. This so called belief was called geocentrism. Nicolaus was one fo the first few who pushed heliocentrism.

Answer:

B. Sun was the center of the solar system.

Without an unbalanced force, a moving object will not only keep moving, but its speed and direction will also remain the same. True
False

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This is true. Because there is no other force that is causing a change in direction and speed. Remember Newton's First Law of motion. An object in motion will continue in motion and an object at rest will be at rest UNLESS an unbalanced force acts on the object.

50.0 meters away from a building. Tip of the building makes an angle of 63.0° with the horizontal. What is the height of the building