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3 years ago

What is Acceleration?

2 answers:

5 0

Acceleration is the rate of change of velocity of an object. Thus when the velocity ( direction or magnitude) of an object changes, we say that the particle is accelerating. Mathematically it is written as

a= $\frac{dv}{dt}$

The units of acceleration are m/s²

Acceleration can be positive or negative. If the velocity of an object increases, we call that as positive acceleration and if the velocity of an object decreases, we call that as the negative acceleration.

Talja [164]3 years ago

5 0

Acceleration is a change in velocity over time. Acceleration can be either an increase of a decrease. Negative acceleration is sometimes called deceleration.

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What happens when a roller coaster car moves down from the top of a hill?

VARVARA [1.3K]

-- It accelerates.
-- Its speed increases.
-- It gains momentum.
-- It loses altitude.
-- It loses potential energy.
-- It gains kinetic energy.
-- Its wheels make a lot of noise.
-- Everybody screams.

6 0

4 years ago

Read 2 more answers

A man is traveling on a bicycle at 14 m/s along a straight road that runs parallel to some railroad tracks. He hears the whistle

deff fn [24]

Answer:

Explanation:

b ) The problem is based on Doppler's effect of sound

f = f₀ x (V - v₀) /( $V+v_s$ )

f is apparent frequency ,f₀ is real frequency , V is velocity of sound , v₀ is velocity of observer going away , $v_s$ is velocity of source going away

778 = 840 x (340 - 14)/ (340 + $v_s$ )

340 + $v_s$ = 341.18

$v_s$ = 1.18 m /s

it will go away from the observer or the cyclist.

speed of train = 1.18 m /s

a )

For a stationary observer v₀ = 0

f = f₀ x V /( $V+v_s$ )

= 840 x 340 / (340 + 1.180)

= 837 Hz

6 0

3 years ago

The Strength of an electromagnet can be increased by reducing the number of turns on the wire coil true or false

ad-work [718]

Answer:the answer is true

Explanation:because as u add more coil/wrap more coil around the nail the field get stronger and stronger to attract more nails

Hope this helped

5 0

4 years ago

Nuclear reactors use fuel rods to heat water and generate steam. Is this process endothermic or exothermic?

Anna71 [15]

Explanation:

Exothermic reaction is defined as the reaction in which release of heat takes place. This also means that in an exothermic reaction, bond energies of reactants is less than the bond energies of products.

Hence, difference between the energies between the reactants and products releases as heat and therefore, enthalpy of the system will decrease.

Whereas in an endothermic reaction, heat is supplied from outside and absorbed by the reactant molecules. Hence, enthalpy of the system increases.

As water acts as a coolent and when fuel rods in a nuclear reactor are immersed in it then heat created by coolent is absorbed by water and then it changes into steam.

Since, absorption of heat occurs in the nuclear reactor. Therefore, it is an endothermic reaction.

Thus, we can conclude that nuclear reactors use fuel rods to heat water and generate steam. This process is endothermic.

5 0

3 years ago

Read 2 more answers

If the mass of a material is 42 grams and the volume of the material is 15 cm^3, what would the density of the material be?

Fantom [35]

Density = mass / volume

Density = 42g / 15cm^3

Density = 2.8g/cm^3

3 0

4 years ago