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Jlenok [28]
3 years ago
12

9) At a construction site, a small crane is raising two boxes of nails on a plank to the roof. One box has already been opened a

nd is half full, while the other box is new. The boxes, including the nails, weight 10 kg and 20 kg, respectively, and are the same size
a) As the plank tilts towards the heavier box, predict which box of nails will start to slide first. Explain your prediction
Physics
2 answers:
Varvara68 [4.7K]3 years ago
8 0

Answer:

The two boxes will start sliding at the same angle. Their different masses does not affect when one of the boxes will start sliding.

Explanation:

The two boxes will start sliding when the frictional force,Ff= The gravitational force,Fg

Ff= mgcos theta× coefficient of friction

Fg= mgsintheta

Ff=Fg= mgsintheta=mgcos theta×coefficient of friction

Dividing through with mg on both sides gives

Sintheta=ucostheta

Sintheta/costheta= Tan theta

Theta= tan^-1(coefficient of fricition)

From the solution mass of the boxes and gravity does not affect when the boxes will start sliding.

rosijanka [135]3 years ago
3 0
Box 1 (having a mass of 10 kg) will slide first as it has less inertia than the other box. It will also require less force to overcome static friction between the surface of the plank and that of the first box.
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A 120 V potential difference is applied to a space heater that dissipates 674 W during operation. (a) What is its resistance dur
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Answer:

(a) 21.36 ohms

(b) 5.62 A

Explanation:

Parameters given:

Potential difference, V = 120 V

Power, P = 674 W

(a) Power is given as:

P = V²/R

Where R is resistance

=> R = V²/P

R = 120²/674

R = 14400/674

R = 21.36 ohms

(b) Power is also given as:

P = I*V

Where I = Current (time rate of flow of Electric charge)

=> I = P/V

I = 674/120

I = 5.62 A

6 0
3 years ago
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dsp73

Answer:

Given: mass 1200kg

initial velocity: 4m/s

finial velocity: 10 m/s

time 3 sec

then

speed; initial velocity + final velocity/2

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4-08 t 1 - / S P = 1 / P = S 1 S= P Def. of Speed​
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3 years ago
Are worm holes a real phenomenon?
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A tow truck exerts a force of 1850 N on a 840 kg car. What is the acceleration of the car during this time?
Harrizon [31]

Answer:

<h2>2.2 m/s²</h2>

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

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