A 1000 watt microwave oven takes 90 seconds to heat a bowl of soup. How many joules of energy does it use?

Answers

Answer 1

Answer: Energy in Joules = Power in Watts * Time in seconds.

Energy = 1000 watt * 90 seconds.

Energy = 90 000 Joules.

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Seed is 4m/s 3 sec later at the bottom of the slope it's speed is 22m/s what is the average acceleration
A force is applied to a block, causing it to accelerate along a horizontal, frictionless surface. The kinetic energy gained by the block is equal to which of the following
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a 1.2 m wire carries a current of 10.0 A in a uniform magnetic field of 0.050T. Find the magnitude of the magnetic force on the wire.

a 0.4 kg block rests on a desk. the coefficient of static friction is 0.2. You push the side of the block but do not have a spring scale to measure the force you use. the block does not move. which statement is true about the force of static friction?

Answers

Answer:

D. It is no smaller than $0.78N$

Explanation:

The question is incomplete. These are all the options :

A. It is no larger than $0.78N$

B. It is $0.78N$

C. It is $0.08N$

D. It is no smaller than $0.78N$

To solve this problem, we have the data of :

$m=0.4kg$

Where ''m'' is the mass of the block

μ = 0.2

Where ''μ'' is the coefficient of static friction

If we want to find the magnitude of the force of static friction we need to use the following equation :

$F_(sf)=$ μ. $F_(N)$ (I)

Where '' $F_(N)$ '' is the normal force that the desk exerts on the block. Its magnitude is equal to the weight (because we suppose that the block rests horizontally on the desk).

The weight '' $W$ '' can be calculated as :

$W=m.g$

Where ''m'' is the mass and ''g'' is the acceleration due to gravity.

The value of ''g'' is

$g=9.81(m)/(s^(2))$

The weight of the block is

$W=(0.4kg).(9.81(m)/(s^(2)))$

$W=3.924N$

Now, the weight is equal to the normal force ⇒

$W=F_(N)=3.924N$

Using the equation (I) :

$F_(sf)=(0.2).(3.924N)$

$F_(sf)=0.7848N$

The correct option is D. It is no smaller than $0.78N$

Static friction is greater than Applied force

When using a film camera, what must you do to bring an object into focus?a.move the lens toward or away from the film.
b.close the diaphragm.
c.adjust the speed of the shutter.
d.adjust the angle of the mirror.

Answers

Answer:

a. move the lens toward or away from the film.

Explanation:

Lets discuss the function of different components of the camera

a). Lens : Lens position is set to focus the image on the film as we know that

$(1)/(d_i) + (1)/(d_0) = (1)/(f)$

here we know that position of lens can adjusted by changing the value of distance from object and that will help to focus the image on the film.

b). diaphragm. = It is used to control the intensity of light to enter into the lens so that light is adjusted.

c). speed of the shutter = By changing the speed of shutter we can control the light entering into the lens which can control the brightness of picture

d) Angle of mirror : by adjusting the angle of mirror we can set the orientation of the image that is formed

Answer:

option (A) is correct

Explanation:

To bring the object in focus, you can change the distance between the film and the lens by moving the lens towards or away from the film.

As the lens is used to click the pictures of objects which are placed at different distances from the camera.

By using the lens formula

1 / f = 1 / v - 1 / u

Where, f is the focal length of the lens, u be the distance between lens and the object and v be the distance between image and the lens.

We can say that f is constant and u is constant so, we have to change the value of v that means the distance between the lens and the film to focus the images of the objects on the film.

How does heat differ from thermal energy

Answers

Ok, so the easiest thing to do would be to first figure out the definitions, and then compare the terms from there. So, thermal energy is basically the inside or internal temperature thats part of a system due to its temperature. And, the definition of heat is high in temperature, or or something having the quality of being hot. So, if you use those definitions, you can come up with various differences. One of those differences could be that heat is the overall temperature or measure of the heat of an object, while thermal energy can be measured as the kinetic energy held within free particles or, the thermal energy per particle.

Final answer:

Thermal energy is the total internal kinetic energy due to the random motion of particles in an object, while heat is a form of energy transfer that happens due to a temperature difference between two objects or systems.

Explanation:

Heat and thermal energy are related concepts in physics but they are not the same thing. Thermal energy is the total internal kinetic energy of an object due to the random motion of its atoms and molecules. It is dependent on the temperature, mass, and type (or specific heat) of the material.

Heat, on the other hand, is a form of energy transfer that occurs due to a temperature difference between two objects or systems. It is the process of transfer of thermal energy from a hotter object to a cooler one. So, heat is a form of thermal energy in transit, typicallyg transferrin from areas of high temperature to areas of low temperature.

Learn more about difference between heat and thermal energy here:

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As a moving object's velocity decreases, its momentum decreases.Please select the best answer from the choices provided
T
F

Answers

Explanation :

The momentum of an object is defined as the product of its mass and the velocity with which it is moving. It is denoted as p.

Mathematically, it is written as :

$p=mv$

m is the mass of an object

v is the velocity

So, it is clear that the momentum of an object is directly proportional to its velocity.

The statement "as a moving object's velocity decreases, its momentum decreases" is absolutely true.

From the choices provided, the better answer is 'T'. The other one does not apply.

What is the currency for performing work and what is its unit?

Answers

The currency for performing work is called : Energy

And Energy's unit of measurement is : Joule

The amount of energy you've inputed will always equal the output.

For example, in order to do a 500 joules of work, you need 500 joules of energy

Answer:

The currency for performing work is called : Energy

And Energy's unit of measurement is : Joule

The amount of energy you've inputed will always equal the output.

For example, in order to do a 500 joules of work, you need 500 joules of energy

Explanation:

A 2-kg object is moving 6 m/s in a horizontal direction.How much net force is required for this object to continue its state of motion?
Α. Ο Ν
B.
2N
C.
3 N
12 N

Answers

Answer: A) O N

Explanation:

An object in motion will maintain its state of motion. The presence of an unbalanced force changes the velocity of the object.

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