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iogann1982 [59]

3 years ago

14

Does the speedometer of a car read average speed or instantaneous speed?

1 answer:

aleksandrvk [35]3 years ago

8 0

Speedometer of car read instantaneous speed of course. Its because when you stop it instantaneous show 0. If speedometer show average speed there should be different value than 0 (much greater) just when you stop.
Maybe there are car with speedometer with average speed but the time from which the average is taken is extremely small. Its simply instantaneous speed.

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4 0

3 years ago

A mass of 25kg is moving and is stopped in 1.2 seconds with an acceleration of 1.0 m/s squared what is the force on the mass?

Phantasy [73]

F=ma therefore 25kg*1.0m/s^2=25N force on the mass

6 0

3 years ago

How many balls are there in a ski ball machine?

gtnhenbr [62]

Answer:

i think 2 per each sac

Explanation:

i dont know for sure...

Hope this helps

8 0

2 years ago

Which process usually requires water?A.Physical weatheringB.ErosionC.Mass wastingD.Chemical weathering

MAXImum [283]

Answer:

B erosion

Explanation:

Erosion would usually require water

8 0

3 years ago

Suppose the ends of a 27-m-long steel beam are rigidly clamped at 0°C to prevent expansion. The rail has a cross-sectional area

frozen [14]

Answer:

F = 1.58*10^{11} N

Explanation:

given data:

length of steel beam = 27 m

cross sectional area of rail = 35 cm

$\Delta T = 39$ Degree celcius

change in length of steel beam is given as

$\Delta L = L_O \alpha \Delta T$

$= 20*1.1*10^{-5}*39$

$=8.58*10^{-3}$ m

Young's modulus is

$Y = \frac{FL}{A\Delta L}$

$F = \frac{ YA\Delta L}{L}$

$= \frac{2.0*10^{11}*25*10^{-4}8.58*10^{-3}}{27}$

F = 1.58*10^{11} N

5 0

3 years ago