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Bond [772]
2 years ago
15

A car accelerates uniformly from rest tona speed of 30.0 mi/h in 12.0s. Find the distance the car travels during this time? Find

the constant acceleration of the car?​
Physics
1 answer:
meriva2 years ago
5 0

Answer:

2.5 mi/s^2

Explanation:

please see paper for work!

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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
vazorg [7]

Answer:879.29 N-m

Explanation:

Given

mass of first child m_1=44 kg

distance of first child from tree is r_1=1 m

tree is inclined at an angle of \theta =27^{\circ}

mass of second child m_1=27 kg

distance of second child from tree is r_2=2.1 m

Weight of first child=m_1g=431.2 kg

Weight of second child=m_2g=264.6 kg

Torque of first child weight=m_1g\cos \theta \cdot r_1

T_1=44\times 9.8\times \cos 27\times 1=384.202 N-m

Torque of second child weight=m_2g\cos \theta \cdot r_2

T_2=27\times 9.8\times \cos 27\times 2.1=495.096 N-m

Net torque T_{net}=T_1+T_2=384.202+495.096=879.29 N-m

6 0
3 years ago
When a football is kicked, the action and reaction forces do NOT cancel each other out because
AfilCa [17]

Answer:

C

Explanation:

The kicker exerts more force of the football which is why the football moves when its kicked.

6 0
3 years ago
You have a lightweight spring whose unstretched length is 4.0 cm. First, you attach one end of the spring to the ceiling and han
sleet_krkn [62]

Answer:

2.2nC

Explanation:

Call the amount by which the spring’s unstretched length L,

the amount it stretches while hanging x1

and the amount it stretches while on the table x2.

Combining Hooke’s law with Newton’s second law, given that the stretched spring is not accelerating,

we have mg−kx1 =0, or k = mg /x1 , where k is the spring constant. On the other hand,

applying Coulomb’s law to the second part tells us ke q2/ (L+x2)2 − kx2 = 0 or q2 = kx2(L+x2)2/ke,

where ke is the Coulomb constant. Combining these,

we get q = √(mgx2(L+x2)²/x1ke =2.2nC

4 0
3 years ago
Where does the cart have the most velocity(speed)?
Varvara68 [4.7K]

Answer:

point c

Explanation:

the cart has accelerated and is at the lowest point on the path .

consider the acceleration due to gravity converting potential to kinetic energy

6 0
3 years ago
Read 2 more answers
What material parameters determine resistivity?
sleet_krkn [62]

Answer:

Resistivity \rho =\frac{RA}{l}

It depends upon cross sectional area and length of material

Explanation:

The resistance of any material is given by R=\frac{\rho l}{A}, here \rho is the resistivity of material , l is length of material and A is cross sectional area

So resistivity \rho =\frac{RA}{l}

So resistuivity of any material depends upon area of cross section and length of material

If cross sectional area will be more then resistivity will be more. And is length of the material will be more then resistivity will be less

3 0
2 years ago
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