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3 years ago

Which of the following is an example of projectile

Physics

1 answer:

jonny [76]3 years ago

7 0

Answer:

The answer is choice A.

Explanation:

Assuming you are in a situation with a gravitational field. You can divide the motion of the bullet into two components. One horizontal and the other in the vertical.

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A copper wire has a radius of 3.5 mm. When forces of a certain equal magnitude but opposite directions are applied to the ends o

denpristay [2]

Answer:

The tensile stress on the wire is 550 MPa.

Explanation:

Given;

Radius of copper wire, R = 3.5 mm

extension of the copper wire, e = 5.0×10⁻³ L

L is the original length of the copper wire,

Young's modulus for copper, Y = 11×10¹⁰Pa.

Young's modulus, Y is given as the ratio of tensile stress to tensile strain, measured in the same unit as Young's modulus.

$Y =\frac{Tensile \ stress}{Tensile \ strain} \\\\Tensile \ stress = Y*Tensile \ strain\\\\But, Tensile \ strain = \frac{extension}{original \ Length} = \frac{5.0*10^{-3} L}{L} = 5.0*10^{-3}\\\\Tensile \ stress = 11*10^{10} *5.0*10^{-3} \ = 550*10^6 \ Pa$

Therefore, the tensile stress on the wire is 550 MPa.

8 0

3 years ago

Two racecars are driving at constant speeds around a circular track. Both cars are the same distance away from the center of the

Alenkasestr [34]

Answer:

The acceleration of car 2 is four times of the acceleration of car 1.

Explanation:

The centripetal acceleration of the object is possessed when it moves in a circular path. It is given by :

$a=\dfrac{v^2}{r}$

In this case, two race cars are driving at constant speeds around a circular track. Both cars are the same distance away from the center of the track, but car 2 is driving twice as fast as car 1.

So,

$\dfrac{a_1}{a_2}=\dfrac{v_1^2}{v_2^2}$

1 and 2 represent car 1 and car 2 respectively.

$v_2=2v_1$

So,

$\dfrac{a_1}{a_2}=\dfrac{v_1^2}{(2v_1)^2}\\\\\dfrac{a_1}{a_2}=\dfrac{v_1^2}{4v_1^2}\\\\\dfrac{a_1}{a_2}=\dfrac{1}{4}\\\\a_2=4\times a_1$

So, the acceleration of car 2 is four times of the acceleration of car 1.

4 0

3 years ago

A car traveling at 12 m/s slows down with an acceleration of -1.5 m/s2. What is the

Alex777 [14]

Answer:

using s=ut +0.5at^2

u=12m/s

a=-1.5m/s2

t=6 s

s=54m

7 0

3 years ago

Match the words in the left-hand column to the appropriate blanks in the sentences in the right-hand column. Use each word only

Likurg_2 [28]

Answer:

1. Solar nebula

2. Planetesimals.

3. Heavy bombardment.

4. Accretion.

5. Solar winds

6. Condensation.

7. Frost line.

8. Radiometric dating.

Explanation:

Solar nebula is a cloud of gases and was created by the gravitational collapse of the dust and hydrogen in a form molecular cloud and has a hot dense center.

Planetesimals are solid objects that are formed by the debris from the disks and believed to have formed some 46 billion years.

The period of heavy bombardment is known to have been due to the intense spike of asteroids about 4 billion years ago. That lead to the formation of craters on earth and moon.