4 years ago

Jack and Jill have a pail of water. Which action will cause the molecules of water to move faster?

Physics

2 answers:

sasho [114]4 years ago

8 0

Heat will make the water move faster

Tcecarenko [31]4 years ago

7 0

Heating up the water.

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A 1000kg car is rolling slowly across a level surface at 1 m/s heading twoards a group o fsmall innocent children. The doors are

Degger [83]

Answer:

The force required to push to stop the car is 288.67 N

Explanation:

Given that

Mass of the car, m = 1000 kg

Initial speed of the car, u = 1 m/s

The car and push on the hood at an angle of 30° below horizontal, $\theta=30^{\circ}$

Distance, d = 2 m

Let F is the force must you push to stop the car.

According work energy theorem theorem, the work done is equal to the change in kinetic energy as :

$W=\dfrac{1}{2}m(v^2-u^2)F\times d=\dfrac{1}{2}m(v^2-u^2)$

$v = 0$

$Fd\ cos\theta=\dfrac{1}{2}m(u^2) F=\dfrac{\dfrac{1}{2}m(u^2)}{d\ cos\theta}F=\dfrac{\dfrac{1}{2}\times 1000\times (1)^2}{2\ cos(30)}F = -288.67 N$

The force required to push to stop the car is 288.67 N

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3 years ago

The red light emitted by a helium–neon laser has a wavelength of 632.8 nm. What is the frequency of the light waves?

Monica [59]

f = 4.74 × 10 ^14 Hz

hope this helps:)

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3 years ago

If the 50-kg box is lifted 0.4 m with an 8 m/s2 acceleration, what would be the work done?

grigory [225]

Explanation:

work done=force ×distance

force=Mass ×accelleration

work done=50×8×0.4

=160J

please like and Mark as brainliest

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3 years ago

An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the b

Anna71 [15]

Answer: friction

Explanation:

Because when you rub to objects together it creates static electricity

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3 years ago

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if a runner's is 400 w as she runs,how much chemical energy does she convert into other forms in 10.0 minutes?

Fiesta28 [93]

Explanation:

The runner runs for a total time of

\Delta t=10.0 min= 600 sΔt=10.0min=600s

The energy converted by the runner during this time is equal to the power of the runner times the total time:

E=P \Delta t=400 W \cdot 600 s =2.4 \cdot 10^5 JE=PΔt=400W⋅600s=2.4⋅10

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4 years ago