for the whole page done i reward u with 50 points i am very tired and i have many work to do so thank you guys for the help

Answer:

Space

Explanation:

Solar energy is energy from the Sun. This energy is in form of radiation heat and light. When solar energy reaches a surface it bounces off. This is because they are radiation waves.

The three rays in a ray diagram start from a single point on the object.

The focal point of a lens is the point where light rays parallel to the axis are brought to a point.

The focal point is responsible for the converging of light rays coming from the object but the rays do not start here.

Thus, the three rays in a ray diagram start from a single point on the object.

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Answer:

D

Explanation:

Answer:

So as the mass of either object increases, the force of gravitational attraction between them also increases. If the mass of one of the objects is doubled, then the force of gravity between them is doubled.

Explanation:

Welcome

The frequencies of seismic waves will check if the presence of the waves have made buildings with weak foundations to be prone to destruction.

This is defined as the number of occurrences of a repeating event per unit of time and the unit is hertz.

Knowing the frequency of the seismic wave is a good safety precaution which has to be taken to prevent loss of lives and properties.

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Answer:

If a seismic wave has the same frequency as the resonance of a building, the risk of damage is greatest.

Explanation:

The conclusions that can be drawn about how objects can exert forces on each other even when they are not in contact is due to Earth's gravitational force as proposed by Newton.

A non contact force is a type that occurs when two objects that are not in contact exerts force on each other.

This type of force is possible because of gravitational force of Earth.

Thus, the conclusions that can be drawn about how objects can exert forces on each other even when they are not in contact is due to Earth's gravitational force as proposed by Newton.

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(a) The moment of inertia of the sign for rotation about the side of length h is 1.24 kgm².

(b) The kinetic energy of the sign when it is rotating about an axis is 141.37 J.

The moment of inertia of the sign for rotation about the side of length h is calculated as follows;

I = 2 x ¹/₃M(b/2)²

I = 2 x ¹/₃Mb² x ¹/₄

I = ¹/₆Mb²

I = ¹/₆ x 4.4 x 1.3²

I = 1.24 kgm²

K.E(rot) = ¹/₂Iω²

where;

K.E(rot) = ¹/₂(1.24)(15.1)²

K.E(rot) = 141.37 J

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Answer:

yes

Explanation:

First show me your or

The lab activity is not found here but a hypothesis is a given explanation of an observation from the real world.

A hypothesis is a scientific and testable explanation for an observation made by observing the real world.

Hypotheses must be falsifiable, it means that they can be confirmed or rejected by using the scientific method.

In conclusion, the lab activity is not found here but a hypothesis is a given explanation of an observation from the real world.

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Answer:

A,

Explanation:

im going to choose a because they should probably still water it so it doesn’t die at least until it grows or gets a little bigger.

Answer:

c. a and c

Explanation:

ammeters are connected in series to measure charge/current

Answer:

identify the action reaction force in the following cases

a boy walking on the ground

firing a bullet from the gun

a book lying on the table

a boy swimming in the swimming pool

launching of a rocket from the earth surface

Answer:

A Shift it to the right towards the products

Explanation:

If more reactants or products are added to a reaction system at equilibrium, the equilibrium will shift away from what was added to lower its concentration. If a reactant or product was removed from a reaction system at equilibrium, the equilibrium systems will shift to replace some of what was removed.

Answer:

I think it is A and D

Explanation:

Answer: The Q arrow

Explanation: when the solid is heated it changes into a liquid state first this action represented the Q arrow

Answer:

Its D

Explanation:

Bc i got it right on edge

4.  The answer is that you will see the same sights as when you are resting.  That is because you and mirror are in rest one relative another.  If your relative speed is 0, it doesn't matter how quickly you both travel in relation to other objects.

5. The relativistic effects will not alter if the speed of light is reduced to 50m/s. According to the principle of constancy (2nd postulate), the upper limit of speed is 50m/s, which will be impossible for material objects to achieve because as the speed of light decreases, the sizes of humans and all other materials decrease as well, decreasing our relativistic velocity and thus making c=50m/s unattainable for material objects, and thus the relativistic effects will remain unchanged. A pedestrian must use caution when crossing the roadway. Let's assume you see a car arriving at 60 kilometers per hour, or 16.666 meters per second, from a distance of 100 meters. It'll take 6 seconds to arrive, giving you plenty of time to cross the street. Because the light reflected from the car to your eyes left the car two seconds ago, the car will reach at your location in four seconds and hit you (if the car is travelling in the lane on the far side of the road). It looks to you that approaching automobiles traveling at the legal limit are traveling at a speed of 100 / 4 = 25 m/s, which is 50% faster than the genuine speed of 16.666 m/s. When considering whether or not it is safe to cross the road, one would quickly become accustomed to this.

6.

Answer:

A chemical bond is a force of attraction between atoms or ions. Bonds form when atoms share or transfer valence electrons. Valence electrons are the electrons in the outer energy level of an atom that may be involved in chemical interactions. Valence electrons are the basis of all chemical bonds.

Based on the calculations, the electric sander (sanding) is the more expensive in terms of electricity used.

Mathematically, the quantity of energy consumed by an electrical device can be calculated by using this formula:

Energy consumption = power × time

For the electric saw, we have:

Substituting the given parameters into the formula, we have;

Energy consumption = 1,200 × 20

Energy consumption = 24,000 Joules.

For the electric sander, we have:

Substituting the given parameters into the formula, we have;

Energy consumption = 1,000 × 30

Energy consumption = 30,000 Joules.

Therefore, the electric sander (sanding) is the more expensive in terms of electricity used.

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Answer: sanding

Explanation:

Energy used by saw = power × time = 1,200W × 1,200s = 1,440,000J.

Energy used by sander = power × time = 1,000W × 1,800s = 1,800,000J.

The sander uses more energy.

Hello!

We can use the following relationship:

[tex]\Delta KE = W = F \cdot d[/tex]

ΔKE = Change in Kinetic Energy (J)
W = Work done on object (J)

F = Force (N)

d = distance of which the force is applied to the object. (This is equivalent to the length of the gun barrel, or 0.8 m)

Also, recall that:
[tex]KE = \frac{1}{2}mv^2[/tex]

m = mass of bullet (0.02 kg)

v = velocity of bullet (vfinal = 985 m/s, vinitial = 0 m/s)

We can now solve.

[tex]\Delta KE = F \cdot d\\\\KE_f - KE_i = F \cdot d\\\\\frac{1}{2}(0.02)(985^2) - \frac{1}{2}(0.02)(0^2) = (0.8)F\\\\9702.25 = 0.8F\\\\F = \frac{9702.25}{0.8} = \boxed{12127.813 N}[/tex]

Answer:

The momentum of the colliding bodies before and after the collision remains constant.

Explanation:

The momentum is constant.

The electric potential energy of the charge is reduced because it decreases with increase in the distance between charges.

Electric potential energy can be defined as the energy needed to move a charge against an electric field.

It is calculated using the formula;

U = Kq1 q2 ÷ r

Where Q = electric potential energy

k = Coulombs constant

q1 and q2 = charges

r = distance of separation

Electric potential energy is inversely proportional to the distance of separation of the charges.

If the distance of the charges changes from 3mm to 6mm, then the electric potential energy of the charges is reduced because it decreases with increase in the distance of the charges.

Therefore, the electric potential energy of the charge is reduced because it decreases with increase in the distance between charges.

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Answer: B

Explanation: divided by 2

Answer:

As wavelengths increase, the frequency of waves decreases.

Explanation:

As wavelengths increase, the frequency of waves decreases.

When there are longer waves, you could think of them as taking up more time to pass. For example, if there are really long waves (not talking about amplitude) at a beach, you could watch one up-and-down wave for a long time. If there are really short waves, you could watch many waves go by in a short time frame.

Answer:

please specify you question well

The statement that describes the magnetic field inside a bar magnet is as follows: it points from north to south.

A bar magnet is a permanent magnet of rectangular shape.

A magnet generally possess a magnetic field, which is a condition in the space around a magnet which there is a detectable magnetic force and the presence of two magnetic poles.

A bar magnet like every other magnet possesses a magnetic field that points from the north pole to the south pole.

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Answer:

V = E * d      voltage equals charge on plates * separation

F = E q     force on charge q equals electric field * charge

W = F * d     work done equals force times the distance moved

From the very first equation, the voltage depends on the distance between the plates - while the electric field remains constant

The potential difference will decrease as the separation of the plates increases because W remains constant - work done in moving test charge from one plate to another is constant - voltage is constant

When the student the sled jumps off toward the north , the sled most likely move towards the south.

According to the Newton third law of motion, action and reaction are equal and opposite. This means that the direction of the reaction force must also be opposite to that of the action.

As such, when the student the sled jumps off toward the north , the sled most likely move towards the south.

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Answer:

Wasted energy is energy that is not usefully transferred or transformed. Energy cannot be made or destroyed. Energy is transformed into a different form that can be used. When energy is transformed or transferred only part of it can be usefully transformed or transferred.