The ball is dropped from a certain height and is falling to the ground. If its acceleration is a constant 9.8 meters per second squared, how many seconds would it have dropped when the velocity is 49.0 m/s ????

A. 4.9 secs
B. 4 secs
C. 5 secs
D. 9.8 secs

They can travel through matter and through space.

Electromagnetic radiation is one of the many ways that energy travels through space. The heat from a burning fire, the light from the sun, the X-rays used by your doctor, as well as the energy used to cook food in a microwave are all forms of electromagnetic radiation.

While these forms of energy might seem quite different from one another, they are related in that they all exhibit wavelike properties.

The electromagnetic spectrum is a taxonomy of electromagnetic waves that groups them according to their varied wavelengths and frequencies. 

Therefore, They can travel through matter and through space.

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Answer:

Shadows are formed when an opaque object or material is placed in the path of rays of light. The opaque material does not let the light pass through it. The light rays that go past the edges of the material make an outline for the shadow

Explanation:

Explanation:

(a) The gravitational potential energy of the coin above the ground level is given by :

[tex]E=mgh[/tex]

Where

m is mass of the object

g is acceleration

h is height

The kinetic energy of the coin when travelling at a speed v is given by :

[tex]E_k=\dfrac{1}{2}mv^2[/tex]

(b) The coin is dropped from the top of a building of height 380m. Let v the speed of the coin as it hits the ground. Using the conservation of energy.

[tex]v=\sqrt{2gh} \\\\v=\sqrt{2\times 9.8\times 390} \\\\v=87.42\ m/s[/tex]

Hence, this is the required solution.

Answer:

f=force m=mass and a=acceleration

Answers:

1) A process that occurs when an object or a particle moves, referred to as kinetic energy

2) A potential energy is a stored amount of energy that changes depending on the relative positions.

3) Potential Energy is the energy stored in an object due to its position. Kinetic Energy is the energy of motion in a moving object.

4)

  a) C and B

  b) A

  c) From B to A or from C to A

  d) From A to B or from A to C

[tex]\huge\mathfrak\green{answer}[/tex]

1) Kinetic energy of an object is the measure of the work an object can do by the virtue of its motion.

For Example : A river flowing at a certain speed comprises kinetic energy as water has certain velocity and mass.

2) Potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.

For Example : A child at the top of the slide

3) KINETIC ENERGY

POTENTIAL ENERGY

(make sure to draw a table and write them separately)

4)

a) C and B

b) A

c) B to A then C to A

d) A to B then A to C

(mark me brainliest please I need 1 more :))

[tex]\large\sf\green{thank \: you}[/tex]

In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain.

Answer: 2.5 km

Explanation:

5/2 = 2.5 km

60/2 = 30 mins

Use physics kinematic equations to solve for t. Lookup physics kinematic problems on Kahn for more understanding.

Answer:

1/4

Explanation:

Mechanical Advantage = Load/Effort

Given

Effort applied = 24N

Load = 6N

Substitute

MA = 6/24

MA = 1/4

Hence the mechanical advantage is 1/4

Answer:

4

Explanation:

24n/6n=4

Answer: The initial velocity of the projectile is 3.1 km/s        

Explanation:

There is a problem with the question because we do not know in which direction the projectile travels 70 km.

I will assume that the projectile travels 70 km horizontally, as is the usual case.

I will also assume that 25 seconds after the projectile is fired, it hits the ground.

Suppose that the initial velocity of the projectile is V0, and this velocity V0 can be thought as the hypotenuse of a triangle rectangle, then the x-component and the y-component of the velocity will be the catheti of this triangle rectangle, then we can write:

Vy = V0*sin(25°)

Vx = V0*cos(25°).

Now, the vertical problem does not affect the horizontal one, so we can see only the horizontal case.

Here we don't have any force, then there is no acceleration, then the velocity is constant and it is equal to:

v(t) = V0*cos(25°)

For the horizontal position we can integrate over time to get:

p(t) = V0*cos(25°)*t + p0

where p0 is the initial position, and we can assume that it is equal to zero.

Then:

p(t) = V0*cos(25°)*t

Now we know that in t = 25s, the position is 70km

(because the projectile travelled 70km in 25 seconds) then:

p(25s) = 70km = V0*cos(25°)*25s

Now we can solve this for V0.

V0 = 70km/(cos(25°)*25s) = 3.1 km/s          

The initial velocity of the projectile is 3.1 km/s              

The thing you can get from this is that we can analyze the vertical problem and the horizontal problem separately (for example, here we only solved the horizontal case and we ignored the vertical one).

Answer:

Experiments have shown that a magnetic Just sitting next to a wire produced no current flow through that wire. However, If the magnet is brought close to the coil of wire or a relative motion is established between the magnet and the wire then a current is induced in the wire. The closer the magnet moves, the more the Induced current.

Explanation:

A magnet sitting next to a wire would not induce a current in the wire because the magnetic lines of force of the magnet are not in relative motion to the wire.

If you move a magnet close to a  wire, the electrons will move thus generating current.  

Answer:

The space around a charge or a pole in which a force is experienced is called a magnetic field. And a cluster of aligned magnetic atoms is a magnetic domain. When the clustered regions are aligned with one another, they form a magnet

Answer:

Hello your question is incomplete below is the missing piece

What is the magnitude of the boat’s resultant velocity? Round your answer to the nearest whole number.

answer :  25.73 m/s

Explanation:

Given

V1 = 15 miles/hour =  6.71 m/s [ 45° EN ]

V2 = 18 m/s [ 5° NE ]

Calculate  the resultant velocity

Vr = 6.71 m/s[45°] + 18m/s[5°].

Vr = ( 6.71 *Cos45° + 6.71 *sin45°) + ( 18 *Cos5° + 18*sin5° )

Vr = ( 4.74  + 4.74 i  )+  ( 17.93 + 1.57i) = 22.67 + 12.18i.

Therefore the magnitude

= [tex]\sqrt{22.67^2 + 12.18^2}[/tex] = 25.73 m/s

Answer:

circle

Explanation:

because Earth is not oblong

Answer:

[tex]\boxed {\boxed {\sf a= -7 \ m/s^2}}[/tex]

Explanation:

Acceleration is the change in velocity over time.

[tex]a= \frac {v_f-v_i}{t}[/tex]

The object accelerates from 45 meters per second to 10 meters per second in 5 seconds. Therefore,

[tex]v_f=10 \ m/s \\v_i= 45 \ m/s \\t= 5 \ s[/tex]

Substitute the values into the formula.

[tex]a= \frac{ 10 \ m/s - 45 \ m/s}{5 \ s}[/tex]

Solve the numerator.

[tex]a= \frac { -35 \ m/s}{5 \ s}[/tex]

Divide.

[tex]a= -7 \ m/s/s[/tex]

[tex]a= -7 \ m/s^2[/tex]

The acceleration of the object is -7 meters per square second. The acceleration is negative because the object's velocity decreases and the object slows down.

Answer:

Troposphere

High-pressure areas form due to downward motion through the troposphere, the atmospheric layer where weather occurs.

Answer:

Explanation:

speed of sound in 24 degrees celsius

345.48m/s

hence 345.48m/s x 3s = 1036.44m

Answer: No , a chemical change has not occured as it was easily reversed.

Explanation:

Chemical change is defined as a change in which rearrangement of atoms take place and leads to formation of new substances. It can only be reversed with the help of a chemical reaction.

Physical change is defined as a change which leads to change in shape, size or state of the substance changes. No new substance is formed.It can be easily reversed.

As the hair colour was washed out and returned to its original brown colour, it was a physical change.

hydrogen

Explanation:

Selenium is an element whose trace amounts are essential for life, as proven in 1979 based on its cumulative function with vitamin E [23]. Increasing deficiency of selenium in different parts of the world leads to the occurrence of many pathological disorders

Answer:(G=6.67×10−11Nm2/kg2)

Explanation:

Answer:

This is because the protons have more mass and are harder to get moving. Although electrons are very small, their negative electrical charges are still quite strong. Remember, the negative charge of an electron is the same as the positive electrical charge of the much larger in size proton.~Tori

Explanation:

Answer:

15m

Explanation:

Hello! first to solve this problem we must find that so much that the tree grew in the 15 years this is achieved by dividing the height of the tree before and after

the tree grew 10 times its initial length in 15 years, so to find how tall the nail is, we multiply this factor by 1.5m

X=(1.5m)(10)=15m

the nail is 15 meters above ground level

Answer:

i think it's is 30N

Explanation:

i got it right

Explanation:

February according to the urben dictionary

Answer:

lhf

Explanation:

.

Messages travel to and from the brain to other parts of the body through the spinal cord. Thus, brain and spinal cord works together and option A is the correct answer.

The spinal nerves connect the brain to the nerves in the major part of the body. Other nerves connect the brain to the eyes, ears, and other parts of the head directly. This network of nerves relays messages between the brain and the rest of the body.

The brain and spinal cord comprise the central nervous system. The brain is in charge of how we think, learn, move, and feel. The spinal cord relays messages from the brain to the nerves that run throughout the body.

Therefore, brain and spinal cord works together as messages travel to and from the brain to other parts of the body through the spinal cord.

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