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3 years ago

The conversion of thermal energy into mechanical energy requires

Physics

1 answer:

emmainna [20.7K]3 years ago

8 0

Temperature difference is required, so i’m guessing - a. thermometer - would be required to check that temperature.

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A chair of mass 15.0 kg is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force of

Neko [114]

Answer: 185.5672566

Explanation: The friction is not relevant

Normal reaction is the force perpendicular to the surface.

this force resists the downwards forces applied which are gravity and a component of the applied force.

7 0

3 years ago

Read 2 more answers

Can the velocity of a body revese the direction when acceleration is constant?

TEA [102]

Answer:

Yes, the velocity of the object can reverse direction when its acceleration is constant. For example consider that the velocity of any object at any time t is given as: ... At At t = 0 sec, the magnitude of velocity is 2m/s and is moving in the forward direction i.e.v (t) = -2.

7 0

3 years ago

You pull your little sister across a flat snowy field on a sled. Your sister plus the sled have a mass of 25 kg. The rope is at

erik [133]

Answer

Work done will be equal to 1229.296 J

Explanation:

We have given mass of the sister m = 25 kg

Angle between rope and ground $\Theta =38^{\circ}$

Force F = 30 N

So horizontal force $=Fcos\Theta =30\times cos38^{\circ}=23.64N$

Distance traveled d = 52 m

'We have to find the wok done

Work done is equal to multiplication of horizontal force and distance

So work done $W=23.64\times 52=1229.296J$

7 0

3 years ago

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a s

baherus [9]

Given that,

Central maximum = 1 cm

Distance from the window shade to the wall =4 m

We know that,

The visible range of the sun light is 400 nm to 700 nm.

(a). We need to calculate the average wavelength

Using formula of average wavelength

$\lambda_{avg}=\dfrac{\lambda_{1}+\lambda_{2}}{2}$

Put the value into the formula

$\lambda_{avg}=\dfrac{400+700}{2}$

$\lambda_{avg}=550\ nm$

(b). We need to calculate the diameter of the pinhole

Using formula for diameter

$w=\dfrac{2.44\lambda L}{D}$

$D=\dfrac{2.44\lambda L}{w}$

Put the value into the formula

$D=\dfrac{2.44\times550\times10^{-9}\times4}{1\times10^{-2}}$

$D=0.537\ mm$

Hence, (a). The average wavelength 550 nm.

(b). The diameter of the pinhole is 0.537 mm.

7 0

3 years ago

Which statement about thin lenses is correct? In each case, we are considering only a single lens. A. A diverging lens always pr

Alexus [3.1K]

Answer:

E) true. The image is always virtual and erect

Explanation:

In this exercise we are asked to find the correct statements,

for this we can use the constructor equation

1 / f = 1 / p + 1 / q

where f is the focal length, p the distance to the object and q the distance to the image

In diverging lenses, the focal length is negative and the image is virtual and erect

In convergent lenses, the positive focal length, if the object is farther than the focal length, the image is real and inverted, and if the object is at a shorter distance than the focal length, the image is virtual and straight.

With this analysis let's review each statement

A) False. The image is right

B) False. The type of image depends on where the object is with respect to the focal length

C) False. The real image is always inverted

D) False. The image is always virtual

E) true. The image is always virtual and erect

6 0

3 years ago