Which statements about acceleration are true?
Check all that apply.
A. Acceleration is found by dividing the change in speed by the
change in time.
B. Acceleration is a vector quantity.
C. The symbol used for acceleration is a
D. The SI units for acceleration are m/s^2

Explanation:

Given:

Speed of sound = 1400 m/s

Total time taken = 0.4 seconds

To find:

The depth of water

Solution:

As it take 0.4 seconds for the burst to reach the seabed and return (both ways), we can deduce that it takes 0.2 seconds to reach the seabed (one way).

This is because the speed of sound is a constant.

Now, to find the depth, we use the equation

Speed = Distance/Time

Here, we know the values of speed (1400 m/s) and time (0.2 seconds). Distance is the depth of the water, which we need to find. Let the distance be x.

Therefore

1400 = x/0.2

x = 1400 * 0.2

x = 280 m

We get the depth as 280 metres.

Feel free to ask me if you didn't understand any part.

Hope this helps! :D

Answer:

for your first question it is the first answer that is there for your second question it is the second answer that is there

Answer:

Momentum is the product of the mass and velocity of an object.

[tex]p = m \times v[/tex]

[tex]p = 1000kg \times 20 \frac{m}{s} = 20000kg \times \frac{m}{s} [/tex]

Answer:

500 kg

Explanation:

using the formula Potential energy (p.e)=mgh where g= acceleration due to gravity whose value is 9.8

so,pe =mgh

622300=m*9.8*127

m=500kg

Answer:

-2.6

Explanation:

it’s for Acellus

The charge with magnitude and sign is -2.6 x 10⁻⁷ C.

The field developed when a charge is moved. In this field, a charge experiences an electrostatic force of attraction or repulsion depending on the nature of charge.

Given, the electric field 1.22 m from charge is 1570 N/C, pointing

toward the charge.

The electric field and charge is related as

E = kq/r²

q = Er²/k

where k = 9 x 10⁹ N.m²/C²

Substitute the given values in the question, we have

q = 1570 x (1.22)² / 9 x 10⁹

q= 2.6 x 10⁻⁷ C.

Thus, the magnitude and sign  of charge is -2.6 x 10⁻⁷ C.

Learn more about electric field.

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Hello,

A roller coaster is moving 10 m/s and a mass of 7 kg. The roller coaster has kinetic  energy.

✔ We have : Ek = 1/2m x v²; with Ek in J, m in kg and v in m/s

Answer:

0.013N

Explanation:

[tex]F=\frac{mv^{2} }{r}[/tex]

m=0.04, v=4.4m/s, r=60

F=0.013 N

Answer:

Momentum is equal to mass for velocity (p1=mv)

But momentum is also equal to Force for time of impact (p1=Ft). Hence the impact force is inversely proportional to the fall time and directly proportional to the mass and fall velocity : F=mv/t^2 or F=p1/t

If he slows down, v diminishes and F diminishes

Hence correct Answer is C

Answer:

he relative velocity (also or ) is the velocity of an object or observer B in the rest frame of another object or observer A.

Answer:

 w = 4π   rad / s

Explanation:

When the dancer is turning, the body is isolated so the angular momentum is conserved.

initial

         L₀ = I₀ w₀

final

         L_f = I w

in this case it indicates that the initial moment is Io = 28.14 kg m² and the final moment is half

         I = I₀ / 2

frequency and angular velocity are related

         w = 2π f

          w = 2π 1

          wo = 2π   rad / s

how angular momentum is conserved

          L₀ = L_f

          I₀ w₀ = I w

          w = [tex]\frac{I_o}{I}[/tex]  w₀

let's calculate

          w = 2 2π

          w = 4π   rad / s

Answer:

H = 8.45 m

Explanation:

Given that,

Angle of projection, [tex]\theta=37^{\circ}[/tex]

The initial velocity of the ball, u = 20 m/s

We need to find the maximum height reached by the ball. The formula for the maximum height is given by :

[tex]H=\dfrac{u^2\sin^2\theta}{2g}\\\\H=\dfrac{(20)^2\times \sin^2(37)}{2\times 9.8}\\\\H=8.45\ m[/tex]

So, the maximum height reached by the ball is 8.45 m.

Answer:

i dont know about this

Explanation:

Answer:

i believe it's the last one

Explanation:

because the first law of thermodynamics states that energy can be changed from one form to another, but it cannot be created or destroyed.

good luck :)

i hope this helps

have a great day !!

Answer:

10 kg

Explanation:

Answer:

В. An object with mechanical energy is always able to perform work.

Explanation:

Energy can be defined as the ability (capacity) to do work. The two (2) main types of energy are;

a. Gravitational potential energy (GPE): it is an energy possessed by an object or body due to its position above the earth.

b. Kinetic energy (KE): it is an energy possessed by an object or body due to its motion.

Furthermore, the mechanical energy of a physical object or body is the sum of the potential energy and kinetic energy possessed by the object or body and it is measured in Joules.

Mathematically, it is given by the formula;

Mechanical energy = G.P.E + K.E

Hence, the true statement is that an object with mechanical energy is always able to perform work.

Answer:

B

Explanation:

Answer:

В. An object with mechanical energy is always able to perform work.

Explanation:

Energy can be defined as the ability (capacity) to do work. The two (2) main types of energy are;

a. Gravitational potential energy (GPE): it is an energy possessed by an object or body due to its position above the earth.

b. Kinetic energy (KE): it is an energy possessed by an object or body due to its motion.

Furthermore, the mechanical energy of a physical object or body is the sum of the potential energy and kinetic energy possessed by the object or body and it is measured in Joules.

Mathematically, it is given by the formula;

Mechanical energy = G.P.E + K.E

Hence, the true statement is that an object with mechanical energy is always able to perform work.

Answer:

Convex lenses concentrates the light energy to one spot on the paper so that the heat energy accumulates on that one small spot of paper. ... As the heat increases, combustion will occur when the spot becomes too hot and the paper will burn.

Explanation:

Hope it helps!

If you dont mind can you please mark me as brainlest?

I believe the answer for 1) is

PEgrav = mass • g • height

PEgrav = m *• g • h

Answer:

ok i don't know the answer but I send you tomorrow

Answer: Hot

Explanation: Scientist use the color of starts to determine how hot the surface temperature is.

Answer:

solar energy

Explanation:

Please mark as the brainliest.

Answer:

The Name of the heat energy from the is called solar energy.

Answer: The mesocyclone

Explanation: The unsaturated air, if moved upward, will be cooler than the surrounding air and it will sink. ... This convective action (that is, the circulation of air as a result of heat transfer) produces the huge clouds commonly associated with thunderstorms and tornadoes.

Hopes this help um pls mark me as brainliest

As the dough rises, the distance between the raisins increases, indicating that the galaxies are moving apart. D

The evidence from the model supports the student’s claim is as the dough rises, the distance between the raisins increases, indicating that the galaxies are moving apart. The correct option is D.

Fermentation is an anaerobic chemical process that breaks down molecules like glucose. More specifically, fermentation is the foaming that happens during the creation of wine and beer, a procedure that has been around for at least 10,000 years.

Without the aid of oxygen, fermentation enables cells to generate chemical energy from the breakdown of sugar, such as glucose.

As the dough ferments, carbon dioxide is created and trapped as microscopic air bubbles. It increases as a result. The expansion of carbon dioxide during baking causes the bread to rise higher.

Therefore, the correct option is D, As the dough rises, the distance between the raisins increases, indicating that the galaxies are moving apart.

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Answer:

The kinetic energy of an object is directly proportional to the square of its speed. That means that for a twofold increase in speed, the kinetic energy will increase by a factor of four.

Found it on the internet

Explanation:

Hope this helps dude

Answer:

Golf

Explanation:

Golf is NOT considered an invasion game or sport

Answer:

a. Centrifugal force = 1230.77 Newton.

b. Centrifugal force = mv²/r

c. Centrifugal force = 4923.08 Newton.

Explanation:

Given the following data;

Mass = 800kg

Radius = 65m

Velocity = 10m/s

a. To find the force;

Centrifugal force = (800*10²)/65

Centrifugal force = (800*100)/65

Centrifugal force = 80000/65

Centrifugal force = 1230.77 Newton.

b. The force associated with the car is generally referred to as centrifugal force because it's the force required to keep the car in a curved or circular path. It can be calculated using the formula;

Centrifugal force = mv²/r

c. To find the force at twice the speed;

Velocity = 2 * 10 = 20m/s

Centrifugal force = (800*20²)/65

Centrifugal force = (800*400)/65

Centrifugal force = 320000/65

Centrifugal force = 4923.08 Newton.

a. To achieve a car of mass 800 kg goes round a corner of radius 65 m at a            speed of 10 m/s , needed 1230.77 Newton centripetal forces.

b. When an object goes round a corner then centripetal forces keep that object moving in a curved path.

c. When speed is twice. then, 4923.07 Newton centripetal forces needed.

a. Given that car of mass 800 kg goes round a corner of radius 65 m at a

    speed of 10 m/s.

  Centripetal force ,[tex]F=\frac{mv^{2} }{r}[/tex]

  Where m is mass, v is speed of object and r is radius.

   Substituting all values in above equation.

                    [tex]F=\frac{800*10^{2} }{65} =1230.77Newton[/tex]

b. Centripetal force is defined as, the force that is necessary to keep an    object moving in a curved path and that is directed inward toward the center of rotation.

As a car makes a turn, the force of friction acting upon the turned wheels of the car provides centripetal force required for circular motion.

c. When speed is twice, then  [tex]v=10*2=20m/s[/tex]

      Centripetal force,[tex]F=\frac{800*20^{2} }{65} =4923.08Newton[/tex]

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Answer:

a. The thickness of the wire is 2.5 mm.

b. The wire is 0.25 cm thick.

Explanation:

Number of turns of the wire = 10

The length of total turns = 25 mm

a. The thickness of the wire can be determined by;

thickness of the wire = [tex]\frac{length of total turns}{number of turns}[/tex]

                           = [tex]\frac{25}{10}[/tex]

                           = 2.5 mm

Therefore, the wire is 2.5 mm thick.

b. To determine the thickness of the wire in centimetre;

10 mm = 1 cm

So that,

2.5 mm = x

x  = [tex]\frac{2.5}{10}[/tex]

   = 0.25 cm

The wire is 0.25 cm thick.