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3 years ago

Which dog has the most kinetic energy?

Physics

2 answers:

Nadya [2.5K]3 years ago

5 0

A. A dog of mass 14kg running with the speed of 3m/s

Furkat [3]3 years ago

3 0

Nobody actually needs to know how much kinetic energy any of these dogs has.

The purpose of this question is to help you discover whether you know how to calculate kinetic energy, and then to give you some practice at doing it.

You have to calculate the kinetic energy of each dog, and then review your results to see which dog has the most.

The whole secret behind working this problem is the formula for the kinetic energy of any object:

Kinetic Energy = (1/2) · (mass) · (speed)²

The little ² next to 'speed' means 'squared' or 'multiplied by itself'.

(speed)² means (speed · speed) .

So, in order to calculate how much kinetic energy an object has, here's what you do:

-- Take the object's speed. Multiply the speed by itself.

-- Take that number and multiply it by the object's mass.

-- Take that number and throw away half of it.

So now here we go:

Dog A: KE = (1/2) (14 kg) (2 m/s)² = 28 Joules

Dog B: KE = (1/2) (14 kg) (3 m/s)² = 63 Joules

Dog C: KE = (1/2) (11 kg) (5 m/s)² = 137.5 Joules

Dog D: KE = (1/2) 12 kg) (4 m/s)² = 96 Joules

==> Dog C has more kinetic energy than any of the other 3 dogs.

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phase, color, and ductility are all examples of what type of property? chemical changeable physical external

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Phase, color, and ductility are all examples of physical external properties

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3 years ago

Astronomers observe two separate solar systems each consisting of a planet orbiting a sun. The two orbits are circular and have

Oxana [17]

Answer:

(D) 3

Explanation:

The angular momentum is given by:

$\vec{L}=\vec{r}\ X \ \vec{p}$

Thus, the magnitude of the angular momenta of both solar systems are given by:

$L_1=Rm_1v_1=Rm_1(\omega R)=R^2m_1(\frac{2\pi}{T_1})=2\pi R^2\frac{m_1}{T_1}\\\\L_2=Rm_2v_2=2\pi R^2\frac{m_2}{T_2}$

where we have taken that both systems has the same radius.

By taking into account that T1=3T2, we have

$L_1=2\pi R^2\frac{m_1}{3T_2}=\frac{1}{3}2\pi R^2\frac{1}{T_2}m_1=\frac{1}{3}\frac{L_2}{m_2}m_1$

but L1=L2=L:

$L=\frac{1}{3}L\frac{m_1}{m_2}\\\\\frac{m_1}{m_2}=3$

Hence, the answer is (D) 3

HOPE THIS HELPS!!

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3 years ago

T or F A red-hot object is hotter than one that is while-hot?

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Answer:

True. The two laws of thermal radiation state; 1) "Each square meter of a hotter object

Explanation:

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2 years ago

Which of the four fundamental forces is responsible for holding together the molecules of the pizza dough as it is spinning in t

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Answer:

None.

Explanation:

Molecules are formed by an element's need or excess of electrons. For example, in nature oxygen generally exists as 02. Other molecules are formed via chemical reaction. The example here is the burning of gasoline. Gasoline's two main byproducts are water and carbon dioxide.

Hydrogen as an atom has one electron making it unstable. Put a second hydrogen atom next to the first and the two atoms will share electrons to fill the first energy level the atom needs to be stable.

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3 years ago