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3 years ago

A cheetah can go from the state of rest to running at 20m/s in just two seconds. What is the Cheetahs average acceleration

Physics

1 answer:

babymother [125]3 years ago

7 0

acceleration = change in velocity/change in time

so...

a = 20 m/s / 2 seconds

a = 10

hope that helps :)

P.S. found this from Brainly User, sometimes all you have to do is search to find the answer.

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Why do we need to conserve water?It is an unlimited resource.It is a limited resource.There is a lot of water.There is no need t

olchik [2.2K]

Answer:

conserving water is important because it keeps water pure and clean while protecting the inviorment

6 0

3 years ago

A boat radioed a distress call to a Coast Guard station. At the time of the call, a vector A from the station to the boat had a

VashaNatasha [74]

Answer:

d = 39.7 km

Explanation:

initial position of the boat is 45 km away at an angle of 15 degree East of North

so we will have

$r_1 = 45 sin15 \hat i + 45 cos15 \hat j$

$r_1 = 11.64 \hat i + 43.46\hat j$

after some time the final position of the boat is found at 30 km at 15 Degree North of East

so we have

$r_2 = 30 cos15\hat i + 30 sin15 \hat j$

$r_2 = 28.98\hat i + 7.76 \hat j$

now the displacement of the boat is given as

$d = r_2 - r_1$

$d = (28.98\hat i + 7.76 \hat j) - (11.64 \hat i + 43.46\hat j)$

$d = 17.34 \hat i - 35.7 \hat j$

so the magnitude is given as

$d = \sqrt{17.34^2 + 35.7^2}$

$d = 39.7 km$

4 0

3 years ago

.A 0.2-kg aluminum plate, initially at 20°C, slides down a 15-m-long surface, inclined at a 30 angle to the horizontal. The forc

Ainat [17]

To solve this problem, it is necessary to apply the concepts related to Work according to the Force and distance, as well as the concepts related to energy lost-or gained-by heat. Mathematically the energy corresponding to heat is given as:

$Q = mC_p(\Delta T)$

Where,

m = mass

$C_p$ = Specific heat

$\Delta T$ = Change in Temperature

At the same time the Work made by the Force and the distance is given as:

$W = F*d \rightarrow W=mg*d$

As the force is applied at an angle of 30 degrees, the efficient component would be given by the vertical then the work / energy would be determined as:

$W = mg*dsin(30)$

$W = (15m)(0.2kg)(9.81)(sin30)$

$W = 13.24J$

Now this energy is used to heat the aluminum. We can find the change at the temperature as follow:

$Q = mC_p(\Delta T)$

$13.24 = (0.2)(900)(\Delta T)$

$\Delta T = 0.0736 \°C$

Therefore the correct answer is B.

7 0

3 years ago

Which statement about ocean surface currents is false?

Leno4ka [110]

"Ocean surface currents are beautifully depicted in the drawing that accompanies this question."

6 0

3 years ago

The fed can attempt to decrease the federal funds rate by

Nataliya [291]

Answer:

purchasing bonds in order to increase the money supply.

Explanation:

The Federal Reserve raises or lowers interest rates through its regularly scheduled Federal Open Market Committee. That's the monetary policy arm of the Federal Reserve Banking System.

The Fed can attempt to increase the federal funds rate by selling Treasury bills, which decreases bank reserves.

4 0

3 years ago