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DiKsa [7]
3 years ago
14

Imagine you and your friend are trying to rearrange the furniture in your classroom. You push on a desk with a force of 100 n to

the right ,your friendpushes on the same desk with a force of 80 n to the left .What is the net force on the desk
Physics
1 answer:
ch4aika [34]3 years ago
7 0

Answer:20n Force :Right

Explanation:

The Answer To the equation is 20n because If the net force is opposite ways you subtract and the net force is the highest number !

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A 0.71 W point source emits sound waves isotropically. Assuming that the energy of the waves is conserved, find the intensity (a
sveticcg [70]

Answer:

(a) 2.88×10⁻² W/m²

(b) 8.36×10⁻³ W/m²

Explanation:

The intensity of sound from an isotropic point source, with distance L is given as

I = P/(4πL²) .................................... Equation 1

Where I = intensity of sound, P = Power from the source, L = length, π = pie.

(a)

1.4 m from the source.

I = P/(4πL²)

Given: P = 0.71 W, L = 1.4 m, π = 3.14.

Substitute into equation 1

I = 0.71/(4×3.14×1.4²)

I = 0.71/24.6176

I = 0.0288 W/m².

I = 2.88×10⁻² W/m²

(b) 2.6 m from the source.

Given: P = 0.71 W, L = 2.6 m, π = 3.14

Substitute into equation 1

I = 0.71/(4×3.14×2.6²)

I = 0.71/84.9056

I = 0.00836 W/m²

I = 8.36×10⁻³ W/m²

5 0
3 years ago
g The steam above a freshly made cup of instant coffee is really water vapor droplets condensing after evaporating from the hot
geniusboy [140]

Answer:

the final temperature = 74.33°C

Explanation:

Using the expression Q = mcΔT for the heat transfer and the change in temperature .

Here ;

Q = heat transfer

m = mass of substance

c = specific heat

ΔT = the change in temperature

The heat Q required to change the phase of a sample mass  m is:

Q = mL_v

where;

L_v  is the latent heat of vaporization.

From the question ;

Let M represent the mass of the coffee that remains after evaporation is:

ΔT = \frac{mL_v}{MC}

where;

m = 2.50 g

M = (240 - 2.50) g  = 237.5 g

L_v  = 539 kcal/kg

c = 1.00kcal/kg. °C

ΔT = \frac{2.50*539 \ kcal /kg}{237.5 g *1.00 \ kcal/kg . ^0C}

ΔT = 5.67°C

The final temperature of the coffee is:

T_f = T_i - ΔT

where ;

T_I = initial temperature = 80 °C

T_f = (80 - 5.67)°C

T_f =  74.33°C

Thus; the final temperature = 74.33°C

8 0
3 years ago
Read 2 more answers
Along the frictionless path you have chosen, the main force(s) acting on the puck after receiving the kick is (are):
Vaselesa [24]
Gravity, and Normal. Check the comments for why Applied isn't one.
5 0
3 years ago
Which of the following objects cannot make a shadow? Broken piece of glass from a window/wooden pane of the same window? Explain
Lorico [155]

Answer:

broken pieces of glass from a window can't form a shadow.

Explanation:

the reason is that shadow is formed only when light rays hits an opaque object, which doesn't let light to pass through it, but glass is a transparent object, hence light rays passes through it forming no shadow..

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4 0
3 years ago
How many different types of atoms are present in one molecule of aluminum hydroxide, Al(OH)3?
tatyana61 [14]
There are approximately 3 different types of atoms that are present in one molecule of aluminum hydroxide, AI(OH)3.
8 0
3 years ago
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