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3 years ago

You are on a frozen pond, and the ice starts to crack. if you lie down on the ice and begin to crawl, this will

1 answer:

6 0

If you lie down on the ice and begin to crawl, this will spread out your weight more evenly and make it less likely for the ice to suffer a critical failure, in which you might fall below the surface of the ice and into the water. You have better weight distribution by being on more than two points - only your two feet. By crawling you disperse your weight to possibly up to eight points or more. This includes hands, elbows, knees, feet, chest. The dispersing of the weight takes significant pressure off of just one or two points, because as you are walking you are also most likely lifting a foot. By crawling, you remain in constant contact with your weight spread more evenly.

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Suppose that you are standing on a train accelerating at 0.20g. What minimum coefficient of static friction must exist between y

Ilia_Sergeevich [38]

Acceleration = (0.2 x g) = 1.96m/sec^2.
Accelerating force on 1kg. = (ma) = 1.96N. 
1kg. has a weight (normal force) of 9.8N. 
Coefficient µ = 1.96/9.8 = 0.2 minimum. 

Coefficient is a ratio, so holds true for any value of mass to find accelerating force acting. 
e.g. 75kg = (75 x g) = 735N. 
Accelerating force = (735 x 0.2) = 147N

5 0

3 years ago

Read 2 more answers

A punter wants to kick a football so that the football has a total flight time of 4.70s and lands 56.0m away (measured along the

Sindrei [870]

Answer:

Explanation:

How long does the football need to rise?

4.70/3 = 2.35 s

What height will the football reach?

h = ½(9.81)2.35² = 27.1 m

With what speed does the punter need to kick the football?

vy = g•t = 9.81(2.35) = 23.1 m/s

vx = d/t = 56.0/4.70 = 11.9 m/s

v = √(vx²+vy²) = 26.0 m/s

At what angle (θ), with the horizontal, does the punter need to kick the football?

θ = arctan(vy/vx) = 62.7°

3 0

2 years ago

When you increase the temperature of an exothermic reaction the equilibrium will shift?

Colt1911 [192]

Answer : When we increase the temperature of an exothermic reaction the equilibrium will shift to the left direction i.e, towards the reactant.

Explanation :

Le-Chatelier's principle : This principle states that if any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

As the given reaction is an exothermic reaction in which the heat is released during a chemical reaction. That means the temperature is decreased on the reactant side.

For an exothermic reaction, heat is released during a chemical reaction and is written on the product side.

$A\rightleftharpoons B+\text{ heat}$

If the temperature is increases in the equilibrium then the equilibrium will shift in the direction where, temperature is getting decreased. Thus, the reaction will shift to the left direction i.e, towards the reactant.

Hence, when we increase the temperature of an exothermic reaction the equilibrium will shift to the left direction i.e, towards the reactant.

5 0

3 years ago

Please choose the answer that describes the scientific notation for 5,098,000.

galben [10]

D. 5.098 x 106 is the correct answer when reduced to the proper notation.

3 0

3 years ago

Pavlova-9 [17]

Explanation:

momentum = mass x velocity

initial momentum = 100 x 15 = 1500kgm/s

after momentum = 100 x 20 = 2000kgm/s

a =(v-u)/t

a = (20-15)/10

a = 5/10

a = 0.5m/s²

f = ma

f = 100 x 0.5

f = 50N

7 0

3 years ago