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3 years ago

Planetary geologists used meteorite dating and lunar rocks to determine that

1 answer:

8 0

I had to look for the options and here is my answer:
Meteorite dating and lunar rocks are being used by planetary geologists in order to determine that the age of the solar system which is 4.6 billion years old. These meteorites are being tested in order to determine their span of existence. Hope this answer helps.

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Convert 12cm to picometers

Salsk061 [2.6K]

Answer:

1.2e+11

Explanation:

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3 years ago

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Select the correct answer. The police force in a particular city have to catch a serial killer who is on the loose. However, the

Elena-2011 [213]

Answe the answer is E

Explanation:

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2 years ago

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Compounds are formed as a result of ____

katrin [286]

Compounds are formed as a result of elements that are joined and held together by strong forces called chemical bonds.

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3 years ago

To meet a U.S. Postal Service requirement, employees' footwear must have a coefficient of static friction of 0.5 or more on a sp

motikmotik

Answer:

0.79 s

Explanation:

We have to calculate the employee acceleration, in order to know the minimum time. According to Newton's second law:

$\sum F_x:f_{max}=ma_x\\\sum F_y:N-mg=0$

The frictional force is maximum since the employee has to apply a maximum force to spend the minimum time. In y axis the employee's acceleration is zero, so the net force is zero. Recall that $f_{max}=\mu N$

Now, we find the acceleration:

$\mu N=ma_x\\\mu mg=ma_x\\a_x=\mu g\\a_x=0.83(9.8\frac{m}{s^2})\\a_x=8.134\frac{m}{s^2}$

Finally, using an uniformly accelerated motion formula, we can calculate the minimum time. The employee starts at rest, thus his initial speed is zero:

$x=v_0t+\frac{1}{2}a_xt^2\\2x=a_xt^2\\t=\sqrt{\frac{2x}{a}}\\t=\sqrt{\frac{2(3.2m)}{8.134\frac{m}{s^2}}}\\t=0.79 s$

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3 years ago

A metal object with a mass of 19g is heated to 96c, then transferred to a calorimeter containg 75g of water at 18c. the water an

avanturin [10]

Let us say that Cp is the specific heat of the metal object. Then we do a heat balance (heat lost by metal = heat gained by water):

- 19g * Cp * (22degC – 96degC) = 75g * 4.184J/g degC * (22degC – 18degC)

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2 years ago

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