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mojhsa [17]
3 years ago
9

Why does an ice cube melt in your hand? Question 3 options: The ice remains in a solid state even though heat is applied The tem

perature of the ice is greater than the temperature of your hand Sound energy creates vibrations which make the ice melt Heat is transferred from your hand to the ice making it melt
Physics
2 answers:
Anna007 [38]3 years ago
8 0

Answer:

C

Explanation:

iVinArrow [24]3 years ago
6 0

Answer:

3rd choice

Explanation:

heat is transfered causing it to melt

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The boom of a fire truck raises a fireman (and his equipment – total weight 280 lbs) 60 ft into the air to fight a building fire
Simora [160]

Explanation:

Given that,

Weight = 280 lbs

Height = 60 ft

Power = 3.50 hp

(a). We need to calculate the work done by the boom on the fireman

Using formula of work done

Work\ done =Weight\ \times height

W'=W\times h

Put the value into the formula

W'=280\times60

W'= 16800 ftlbf

W'=\dfrac{16800}{778.169}

W'=21.59\ Btu

The work done by the boom is 21.59 Btu.

(b). We know that,

1 hp = 550 ft lbf

So, P = 3.50\times550

P=1925\ ft-lbf/s

We need to calculate the time

Using formula of time

t = \dfrac{W}{P}

Put the value into the formula

t=\dfrac{16800}{1925}

t =8.7\ sec

The time is 8.7 sec.

Hence, This is the required solution.

6 0
3 years ago
A soccer ball is released from rest at the top of a grassy incline. After 8.6 seconds, the ball travels 87 meters and 1.0 s afte
Arturiano [62]

Answer:

a) a = 2.35 m/s^2

Explanation:

(a) In order to calculate the magnitude of the acceleration of the ball, you use the following formula, for the position of the ball:

x=v_ot+\frac{1}{2}at^2     (1)

x: position of the ball after t seconds = 87 m

t: time  = 8.6 s

a: acceleration of the ball = ?

vo: initial velocity of the ball = 0 m/s

You solve the equation (1) for a:

x=0+\frac{1}{2}at^2\\\\a=\frac{2x}{t^2}

You replace the values of the parameters in the previous equation:

a=\frac{2(87m)}{(8.6s)^2}=2.35\frac{m}{s^2}

The acceleration of the ball is 2.35 m/s^2

6 0
3 years ago
When you push an object, it pushes back with an equal and opposite force
Ksju [112]

Answer:

I would say false

Explanation:

Because friction slows it down which means when the object bounces back it will not have the same energy or force that was applied before.

5 0
2 years ago
Jenny and Fred both play a long note on their trombones. A stationary observer hears the sound increasing and decreasing repeate
lilavasa [31]
E=the sound waves from the trombones have slightly different velocity
7 0
3 years ago
Read 2 more answers
Which of the following statements correctly describes the position of the intake and exhaust valves during most of the power sta
I am Lyosha [343]

Both valves are closed during the power stroke.

While the fuel is burning in the cylinder, you want
all the force of the expanding gases to push the
piston down ... you don't want any of the gases
or their pressure escaping. 

If either of the valves was open, even just a crack,
then part of the gases would go blooey out the valve,
and some pressure would be lost that's supposed to be
pushing the piston.

5 0
3 years ago
Read 2 more answers
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