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grandymaker [24]
3 years ago
12

Which of the following choices defines energy in scientific terms?

Physics
2 answers:
snow_tiger [21]3 years ago
8 0
1) B. Energy is the ability to do work

2) C. Energy is conserved, it just goes from one form to another.

3) Work = Force x displacement
= 300 x 100 = 30,000 Joules

4) leaning a brick because no displacement is taking place.

5) They change the amount/strength or direction of the force needed.

6) Less force is needed and applied over a longer distance.

7) Heat is the flow of thermal energy from one object to another.
allsm [11]3 years ago
8 0

1. B. the ability to do work

In fact, energy is exactly defined as the ability to do work: for example, if the gravitational potential energy of an object is 100 J, it means that it can converts this energy into work done.

2. The form of energy changes, but the total energy remains the same

The law of conservation of energy states that the energy cannot be created nor destroyed, but only transformed into different forms: in this case, the electrical energy due to the current inside the circuit is converted into radiant energy, due to the light emitted by the lamp, but the total energy remains the same.

3. 30,000 J

The work done when the force of F=300 N pushes the box for a distance of d=100 m is given by the product between the two:

W=Fd=(300 N)(100 m)=30,000 J

4. leaning against a brick wall on the side of a building

This is not an example of work, because work is defined as the product between the force F and the displacement d:

W=Fd

however, in this case no displacement occurs, so d=0 and W=0.

5. They change the strength or direction of a force.

In fact, simple machines (like pulleys or levers) generally work by multiplying the input force, so that it is able to move/lift a much larger force.

6. Less force is applied over a longer distance.

By using levers, the force is applied over a longer distance. This means that a less force can be used: in fact, the momentum applied is given by

M=Fd

where F is the force applied and d is the distance of the force from the fulcrum: by increasing d, the distance, a less force F can be applied, keeping the same value of momentum M.

7. Heat is the flow of thermal energy from one object to another.

In fact, heat is related to how much thermal energy flows between two objects. Thermal energy, instead, refers to the amount of energy due to the random motion of the molecules inside an object, and it is proportional to the temperature of the object.

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When is the velocity of a mass on a spring at its maximum value?
ehidna [41]

Answer:

A.  when the mass has a displacement of zero

Explanation:

The velocity of a mass on a spring can be calculated by using the law of conservation of energy. In fact, the total energy of the mass-spring system is equal to the sum of the elastic potential energy (U) of the spring and the kinetic energy (K) of the mass:

E=U+K=\frac{1}{2}kx^2 + \frac{1}{2}mv^2

where

k is the spring constant

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

m is the mass

v is the velocity of the mass

Since the total energy E must remain constant, we can notice the following:

- When the displacement is zero (x=0), the velocity must be maximum, because U=0 so K is maximum

- When the displacement is maximum, the velocity must be minimum (zero), because U is maximum and K=0

Based on these observations, we can conclude that the velocity of the mass is at its maximum value when the displacement is zero, so the correct option is A.


8 0
3 years ago
Read 2 more answers
What scientisists stated that animals, as well as plants, are made of cells.?
Andrews [41]
<span>The answer is Mathias Schleiden and <span><span>Theodor Schwann</span></span></span>
7 0
3 years ago
An organ pipe open at both ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the
bazaltina [42]

Answer:

the frequency of the second harmonic of the pipe is 425 Hz

Explanation:

Given;

length of the open pipe, L = 0.8 m

velocity of sound, v = 340 m/s

The wavelength of the second harmonic is calculated as follows;

L = A ---> N   +  N--->N   +   N--->A

where;

L is the length of the pipe in the second harmonic

A represents antinode of the wave

N represents the node of the wave

L = \frac{\lambda}{4} + \frac{\lambda}{2} + \frac{\lambda}{4} \\\\L = \lambda

The frequency is calculated as follows;

F_1 = \frac{V}{\lambda} = \frac{340}{0.8} = 425 \ Hz

Therefore, the frequency of the second harmonic of the pipe is 425 Hz.

5 0
3 years ago
. A vertical electric field is set up in space to compensate for the gravitational force on a point charge. What is the required
Delicious77 [7]

(a) The required magnitude of the electric field when the point charge is an electron is 5.57 x 10⁻¹¹ N/C.

(b) The required magnitude of the electric field when the point charge is an proton is 1.02 x 10⁻⁷ N/C.

<h3>Magnitude of electric field </h3>

The magnitude of electric field is given by the following equation.

F = qE

But F = mg

mg = qE

E = mg/q

where;

  • E is the electric field
  • m is mass of the particle
  • g is acceleration due to gravity
  • q is charge of the particle
<h3>For an electron</h3>

E = (9.11 x 10⁻³¹ x 9.8)/(1.602 x 10⁻¹⁹)

E = 5.57 x 10⁻¹¹ N/C

<h3>For proton</h3>

E = (1.67 x 10⁻²⁷ x 9.8)/(1.602 x 10⁻¹⁹)

E = 1.02 x 10⁻⁷ N/C

Thus, the required vertical electric field is greater when the charge is proton.

Learn more about electric field here: brainly.com/question/14372859

#SPJ1

4 0
2 years ago
. Since the man is walking at a constant velocity, he has what acceleration
docker41 [41]
If he’s walking at a constant velocity there is no acceleration.
6 0
3 years ago
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