You start to roll backwards down a hill on your bike, so you use the brakes to stop your motion. In what direction did you accelerate?

Answers

Answer 1

Answer: If your speed down the hill decreased to zero, then
your acceleration was in the direction UP the hill.

Answer 2

Answer: your legs are gonna be moving foward because ur going to backwards

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The period of a ball moving in a circle is doubled while the radius stays the same. What happens to the velocity of the ball?

Answers

Answer:

The velocity of the ball becomes half when the time period is doubled.

Explanation:

Let $T$ be the time period of the ball, $R$ be radius and $v$ be the velocity of the ball performing circular motion.

Now, for a circular motion, the velocity is given as:

$v=(2\pi R)/(T)$

From the above relation, we can conclude that, velocity is inversely proportional to time period if the radius is constant.

This means that if time period is increased, velocity will decrease and vice-versa.

So, if time period is doubled, the velocity will reduce by half. This can be verified mathematically also given below.

$v_o=(2\pi R)/(T)\nv_n=(2\pi R)/(2T)$

Divide $v_n$ by $v_o$ , we get

$(v_n)/(v_o)=((2\pi R)/(2T) )/((2\pi R)/(T) )\n(v_n)/(v_o)=(T)/(2T)\n (v_n)/(v_o)=(1)/(2)\n\therefore v_n=(1)/(2)v_o$

Here, $v_n\ and\ v_o$ are the new and old velocities.

So, it can be concluded that if the time period is doubled, velocity is reduced by half.

Marina is creating a flow chart of the mechanics of mantle convection and how it relates to tectonic plate movement.

Answers

Evidence of the existence of large-scale convection in the mantle from the top to the bottom of the mantle is the density of the material in the lower mantle according shock compression silicates. Calculations showed that under appropriate pressure and temperature distribution of the density in both parts of the mantle are well distributed density oceanic lherzolites - breeds raised in the transform faults of the ocean floor. This is evidence of the homogeneity of the chemical composition of the mantle at the same time is an indirect indication of the existence of large-scale convection in it, constantly stirring its substanceAnd this convection drives plate tectonics

What is the hardest rock to break with a hammer

Answers

Bedrock might be the answer

Where did the heaven elements that make up the bulk of Earth originate:A In a supernova
B In meteorites
C In the Big Bang
D In the Earth itself
E In the Sun

Answers

the answer is b in the meteorites hope i helped

I don't know what calculation to use, can someone help me?

Answers

Write 3,150,000 j = 4000 j / kg-C then work with your units. Divide each side by 'j', then write '25' in place of 'kg', and you'll have an equation with only 'C' and numbers in it. Solve that equation for 'C'.

Question 6 (1 point)Which fundamental force has not been successfully united with the others in a
particle accelerator?

- weak nuclear force

- electromagnetism

- strong nuclear force

- gravity

Answers

Answer:gravity

Explanation:

i just took the test and it was right!

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