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3 years ago

Please round 1045.2 to three significant digits

Physics

2 answers:

Mrac [35]3 years ago

6 0

Answer:

1040

Explanation:

The rules for significant digits is that non-zero digits are significant figures. The zero in between 1 and 4 is significant because any zeroes between two significant digits are significant. Trailing zeroes if there is no decimal point are insignificant.

Anton [14]3 years ago

5 0

1045

if this is actually if this is right tell me

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Define the term energy density of a body under strain

vodka [1.7K]

Answer:

Please mark as Brainliest!!

Explanation:

Strain energy is defined as the energy stored in a body due to deformation. The strain energy per unit volume is known as strain energy density and the area under the stress-strain curve towards the point of deformation. When the applied force is released, the whole system returns to its original shape.

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3 years ago

At least how many Calories does a mountain climber need in order to climb from sea level to the top of a 5.42 km tall peak assum

Verdich [7]

Answer:

Ec = 6220.56 kcal

Explanation:

In order to calculate the amount of Calories needed by the climber, you first have to calculate the work done by the climber against the gravitational force.

You use the following formula:

$W_c=Mgh$ (1)

Wc: work done by the climber

g: gravitational constant = 9.8 m/s^2

M: mass of the climber = 78.4 kg

h: height reached by the climber = 5.42km = 5420 m

You replace in the equation (1):

$W_c=(78.4kg)(9.8m/s^2)(5420m)=4,164,294.4\ J$ (2)

Next, you use the fact that only 16.0% of the chemical energy is convert to mechanical energy. The energy calculated in the equation (2) is equivalent to the mechanical energy of the climber. Then, you have the following relation for the Calories needed:

$0.16(E_c)=4,164,294.4J$

Ec: Calories

You solve for Ec and convert the result to Cal:

$E_c=\frac{4,164,294.4}{016}=26,026,840J*\frac{1kcal}{4184J}\\\\E_c=6220.56\ kcal$

The amount of Calories needed by the climber was 6220.56 kcal

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3 years ago

As the temperature rises the solubility of all gases in water will _________

pav-90 [236]

Answer:

Decreases.

Explanation:

The rise in temperature of gas increases the kinetic energy of its molecules and they rush out of water instead of dissolving similarly as air rushes out of boiling water in form of bubbles

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3 years ago

the batter swings the bat and makes contact with the ball. when this occurs, the kinetic energy of the bat is transferred to the

Ghella [55]

It will possibly be A) chemical b/c it can make a sound like when the bar hits the ball it makes a sound correct?! and also it created heat especially when it hits the ball. and when the ball MOVES and the bar HITS it creates kinetic energy, but when you hit the ball it doesn’t create a new substance.

7 0

3 years ago

Read 2 more answers

During a baseball game, a batter hits a high pop-up. If the ball remains in the air for 6.22 s, how high does it rise? The accel

BigorU [14]

Answer:

47.4 m

Explanation:

When an object is thrown upward, it rises up, it reaches its maximum height, and then it goes down. The time at which it reaches its maximum height is half the total time of flight.

In this case, the time of flight is 6.22 s, so the time the ball takes to reach the maximum height is

$t=\frac{6.22}{2}=3.11 s$