Will an object with the density of 0.66g float?

The Hoover dam is a hydroelectric power plant that converts the energy of falling water into electricity. Which of the following

vlabodo [156]

The correct answer to the question is : B) The weight of the water, and C) The height of the water.

EXPLANATION :

Before coming into any conclusion, first we have to understand potential energy of a body.

The potential energy of a body due to its position from ground is known as gravitational potential energy.

The gravitational potential energy is calculated as -

Potential energy P.E = mgh

Here, m is the mass of the body, and g is the acceleration due to gravity.

h stands for the height of the body from the ground.

We know that weight of a body is equal to the product of mass with acceleration due to gravity.

Hence, weight W = mg

Hence, potential energy is written as P.E = weight × height.

Hence, potential energy depends on the weight and height of the water.

3 0

4 years ago

Read 2 more answers

Two protons are moving up when they enter a magnetic field that points towards you. What happens to the motion of the particles?

Llana [10]

The protons will possess a force pointing to the right.

The force is called Laurentz Force, which is measured by: F = qvB

Here, q is positive for proton, v and B are cross product determined by right hand rule.

6 0

4 years ago

Read 2 more answers

Ohm's law relates the current, voltage, and resistance in a circuit. Use Ohm's law to determine what will happen to the remainin

krek1111 [17]

Answer:

R = ½ R₀

Explanation:

This is an exercise in Ohm's law,

V = IR

in the initial case

V₀ = I₀ R₀ (1)

indicates that the voltage remains constant and the current is doubled

I = 2 I₀

V₀ = I R

we substitute

V₀ = 2 I₀ R

R = ½ V₀ / I₀

we replace by equation 1

R = ½ R₀

8 0

4 years ago

A 20 kg box on a horizontal frictionless surface is moving to the right at a speed of 4.0 m/s. The box hits and remains attached

yanalaym [24]

Answer:

Work done by the spring is negative

Explanation:

We can answer this question by thinking what is the force acting on the box.

In fact, the force acting on the box is the restoring force of the spring, which is given by Hooke's Law:

$F=-kx$

where

k is the spring constant

x is the displacement of the box with respect to the equilibrium position of the spring

The negative sign in the equation indicates that the direction of the force is always opposite to the direction of the displacement: so, whether the spring is compressed or stretched, the force applied by the spring on the box is towards the equilibrium position.

The work done by the restoring force is also given by

$W=Fx cos \theta$

where

F is the restoring force

x is the displacement

$\theta$ is the angle between the direction of the force and the displacement

Here we know that the force is always opposite to the displacement, so

$\theta=180^{\circ} \rightarrow cos \theta =-1$

Which means that the work done by the spring is always negative, since the direction of the restoring force is always opposite to the direction of motion.

7 0

3 years ago

Stars originate as large bodies of slowly rotating gas.Because of gravity, these clumps of gas slowly decrease in size.The angul

Tamiku [17]

Answer:

E.) conservation of angular momentum

Explanation:

The angular momentum is defined as:

$L=r$ x $mv$

where $r$ is the radius of the star, $m$ is the mass and $v$ the angular velocity.

and angular momentum is an amount that is conserved, so the angular momentum before the star is compressed must be equal to the angular momentum after the star was compressed:

$r_{1}$ x $mv_{1}=r_{2}$ x $mv_{2}$

the second radius is smaller than the first radius, since the star shrinked, the second angular velocity must be greater that the first.

In other words, the angular velicity increases as the star shrinks because of the conservation of angular momentum.

4 0

3 years ago