3 years ago

Which is greater, the mass of the compounds before a chemical reaction or the mass of the compounds after a chemical reaction?

Physics

1 answer:

harkovskaia [24]3 years ago

7 0

The masses before and after are equal

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State three factors that determine the strength of electromagnetic

Sunny_sXe [5.5K]

Answer:

Factors that affect the strength of electromagnets are the nature of the core material, strength of the current passing through the core, the number of turns of wire on the core and the shape and size of the core.Nov 28, 2020

Explanation:

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3 years ago

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Two children hang by their hands from the same tree branch. the branch is straight, and grows out from the tree trunk at an angl

Ratling [72]

The net torque exerted by the children on the branch of the tree is 1382 N-m.

The torque exert by the kids is calculated as

T= 45.6*9.8*1.28*cos27.5°+36*9.8*(2.25-1.28)cos27.5°

T=1382 N-m

Hence, The net torque exerted by the children on the branch of the tree is 1382 N-m.

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3 years ago

Suppose you have three springs with force constants of k1 = k2 = k3 = 3.70 x 10^3 N/m. What is their effective force constant if

disa [49]

Answer:

The effective force constant is 1233.33 N/m.

Explanation:

It is given that,

Force constant 1, $k_1=3.7\times 10^3\ N/m$

Force constant 2, $k_2=3.7\times 10^3\ N/m$

Force constant 3, $k_3=3.7\times 10^3\ N/m$

The effective force constant if one is hung from the other in series is given by :

$\dfrac{1}{K_{eff}}=\dfrac{1}{k_1}+\dfrac{1}{k_2}+\dfrac{1}{k_3}$

$\dfrac{1}{K_{eff}}=\dfrac{1}{3.7\times 10^3}+\dfrac{1}{3.7\times 10^3}+\dfrac{1}{3.7\times 10^3}$

$K_{eff}=1233.33\ N/m$

So, the effective force constant is 1233.33 N/m. Hence, this is the required solution.

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3 years ago

Summarize the steps you might use to carry out an investigation using scientific methods

melomori [17]

1. Make an observation
2. Form a question
3. Form a hypothesis
4. Conduct an experiment
5. Analyze the data and draw your conclusion

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3 years ago

A 20 g bullet is shot from a 10 kg gun with a velocity of 400 m/s. What

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Answer: -.80m/s

Explanation:

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3 years ago