3 years ago

A 5 kg ball is thrown at 4 m/s. What is the ball’s momentum

Physics

1 answer:

daser333 [38]3 years ago

7 0

Answer:

20kgm/s

Explanation:

p=mv

p=5*4

p=20kgm/s

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An elevator does 9.75 x 10(4) J of work on a person riding up to another floor. How much energy does the person gain

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Answer:

9.75 x 10^4 J

Explanation:

Work done, W = 9.75 x 10^4 J

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3 years ago

Encuentre en km.h la velocidad de un tigre que corre 550 km.h en 69min

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Answer:

v = 478.26 km/h

Explanation:

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Distance, d = 550 km

Time, t = 69 min = 1.15 h

We need to find the speed of the tiger. The speed of an object is equal to the total distance covered divided by time taken. So,

$v=\dfrac{550\ km}{1.15\ h}\\\\v=478.26\ km/h$

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3 years ago

1) A plane lands on a runway with a speed of 125 m/s, moving east, and it slows to a stop in 13.0 s. What is the magnitude (in m

valentina_108 [34]

Answer: 1) a = 9.61m/s² pointing to west.

2) (a) Δv = - 37.9km/s

(b) a = - 6.10⁷km/years

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1) For the plane:

$a=\frac{\Delta v}{\Delta t}$

$a=\frac{125}{13}$

a = 9.61m/s²

The plane is moving east, so velocity points in that direction. However, it is stopping at the time of 13s, so acceleration's direction is in the opposite direction. Therefore, acceleration points towards west.

2) Total change of velocity:

$\Delta v = v_{f}-v_{i}$

$\Delta v = -17.1-(+20.8)$

$\Delta v= -37.9$ km/s

The interval is in years, so transforming seconds in years:

v = $\frac{-37.9}{3.15.10^{-7}}$

$v=-12.03.10^{7}$ km/years

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$a=\frac{-12.03.10^{-7}}{2.01}$

$a=-6.10^{7}$

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