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3 years ago

An example of acceleration

Physics

1 answer:

TEA [102]3 years ago

5 0

Answer:

Explanation:

Newton’s Second Law of Motion says that acceleration (gaining speed) happens when a force acts on a mass (object). Riding your bicycle is a good example of this law of motion at work. Your bicycle is the mass.

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What phase are daughter cells in as a result of mitosis

NemiM [27]

They are in interphase

5 0

4 years ago

Upon examining layer M, you find that it contains a small proportion of the radioactive isotope - Potassium-40, which decays int

Westkost [7]

Answer:

t = 2.6 billion years

Explanation:

If potassium becomes 25% of its initial value

so we can say it becomes half two times

as we know that 25% means it is 1/4 times of initial value

so we will have

$N = N_o e^{-\lambda t}$

here we know that

$N = 0.25 N_o$

$0.25 = e^{-\lmabda t}$

$ln 4 = (\frac{ln 2}{T_{1/2}}) t$

$t = 2 T_{1/2}$

$t = 2(1.3 billion \: years)$

t = 2.6 billion years

4 0

3 years ago

A sound wave traveling downward with a speed of about 4,000 m/s suddenly slows to 1,500 m/s not far below the earth’s surface. w

Ksivusya [100]

speed of sound wave depends on elasticity of medium and density of medium

it is given by formula

$v = \sqrt{\frac{E}{/rho}}$

now if wave travel through solid then its speed is maximum while if it travel from gas then its speed is minimum

so initially its speed is given as 4000 m/s and suddenly decrease to 1500 m/s

so here we can say that its medium will change from solid to liquid

<em>so sound will encounter with water </em>

3 0

4 years ago

Read 2 more answers

The potential energy of a catapult was completely converted into kinetic energy by releasing a small stone with a mass of 20 gra

DerKrebs [107]

1,000 grams = 1 kilogram
20 grams = 0.02 kilogram

Kinetic energy = (1/2) (mass) x (speed)²

(1/2) (0.02) x (15)² =

(0.01) x (225) = 2.25 joules

4 0

3 years ago

Read 2 more answers

Anna is sitting in a moving cart and throws a ball straight up. Theoretically, the ball should land in the cart, but it lands on

Likurg_2 [28]

Answer:

Reason for the difference in the ranges of the ball and the cart:

"the average speed of the cart is less than the instant speed of the cart at the time of throwing the ball".

Explanation:

Assuming that the air friction is negligible.

Given that the ball lands on the ground a little before the cart.

So, the range of the ball is more than the range of the cart in the same time interval.

Let the instant speed of the cart is v m/s at the time of throwing the ball in the vertically upward direction, so the speed of the ball in the horizontal direction = v m/s.

Let t be the total time of flight of the ball.

As the gravitational force is acting in the downward direction so it will not change the horizontal velocity of the ball.

So, the range covered by the ball $= vt$ m.

Let u be the average speed of the cart for the time t s (same as the time of flight of ball).

So, the distance by the cart $= ut$ m

As the range of the ball is more than the range of the cart in the same time interval, so

$vt > ut \\\\\Rightarrow v>u.$

So, the reason for the difference in the ranges of the ball and the cart is "the average speed of the cart is less than the instant speed of the cart at the time of throwing the ball".

5 0

3 years ago