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3 years ago

Need help with this physics problem!! 30 points if done!!!

Physics

2 answers:

Goryan [66]3 years ago

4 0

Answer:

40° 70° 8

Explanation:

Kryger [21]3 years ago

3 0

Hello!

For an object sliding down an inclined plane, there are two forces working on the object: The normal force and the force due to gravity.

Breaking the force due to gravity into its components, we get a force of:

Mgsinθ, parallel to the incline's slope. This is the NET force acting on the object, causing it to accelerate.

Since ∑F = m · a:

Mgsinθ = m · a

Divide by the mass:

a = gsinθ

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An object covers a distance of 8 meters in the first second of travel, another 8 meters

andre [41]

Answer:

I guess the acceleration would be 8 meters a second

Explanation:

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2 years ago

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A ball with a mass of 170 g which contains 3.80×108 excess electrons is dropped into a vertical shaft with a height of 145 m . A

yaroslaw [1]

Answer:

A. F=6.65*10^{-10}N

B. south - north

Explanation:

A) We use the Lorentz force

F = qv X B

|F| = qvB

to calculate the magnitude of the force we need the speed of the of the ball.

$v_{f}^{2}=v_{0}^{2}+2gy\\v_{f}=\sqrt{0+2(9.8\frac{m}{s^{2}})(145m)}=53.31\frac{m}{s}$

and by replacing in the formula for the magnitude of the force we have (taking into account the excess of electrons)

$F=(3.8*10^{8})(1.602*10^{-19}C)(53.31\frac{m}{s})(0.205T)=6.65*10^{-10}N$

b. south - north (by the rigth hand rule)

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8 0

3 years ago

During a tennis volley, a ball that arrives at a player at 40 m/s is struck by the racquet and returned at 40 m/s. The other pla

Butoxors [25]

Answer:Racquet force is twice of Player force

Explanation:

Given

ball arrives at a speed of $u=-40\ m/s$

ball returned with speed of $v=40\ m/s$

average Force imparted by racquet on the ball is given by

$F_{racquet}=\frac{m(v-u)}{\Delta t}$

where $m=mass\ of\ ball$

$\Delta t=$ time of contact of ball with racquet

$F_{racquet}=\frac{m(40-(-40))}{\Delta t}$

$F_{racquet}=\frac{80m}{\Delta t}-----1$

When it land on the player hand its final velocity becomes zero and time of contact is same as of racquet

$F_{player}=\frac{m(0-40)}{\Delta t}$

$F_{player}=\frac{-40m}{\Delta t}-----2$

From 1 and 2 we get

$F_{racquet}=-2F_{player}$

Hence the magnitude of Force by racquet is twice the Force by player

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3 years ago

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C. I took the test...........

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3 years ago

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Why do atoms form bonds by donating, accepting or sharing electrons with other atoms?

sineoko [7]

Answer:

atoms form bonds by donating, accepting or sharing electrons with other atoms in order to complete their valence shell electrons

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Explanation:

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3 years ago