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3 years ago

How to find average speed

Physics

2 answers:

marshall27 [118]3 years ago

8 0

Answer:

Average speed (s) = total distance/total elapsed tiime

Explanation:

To calculate the average speed of an object, you must know the total distance an object travels and the total elapsed time of its whole journey.

allochka39001 [22]3 years ago

6 0

Answer:

To find the average speed of an object, divide the total distance covered by the object by the total time it takes the object to cover such distance.

average speed= total distance covered/total time

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A javelin thrower standing at rest holds the center of the javelin behind her head, then accelerates it through a distance of 70

JulijaS [17]

Answer:

a = 580 m/s^2

Explanation:

Given:

- Distance for accelerated throw s_a = 70 cm

- Angle of throw Q = 30 degrees

- Distance traveled by the javelin in horizontal direction x(f) = 75 m

- Initial height of throw y(0) = 0

- Final height of the javelin y(f) = -2 m

Find:

What was the acceleration of the javelin during the throw? Assume that it has a constant acceleration.

Solution:

- Compute initial components of the velocity:

V_x,i = V*cos(30)

V_y,i = V*sin(30)

- Use second equation of motion in horizontal direction:

x(f) = x(0) + V*cos(30)*t

75 = 0 + V*cos(30)*t

t = 75 /V*cos(30)

- Use equation of motion in vertical direction:

y(f) = y(0) + V_y,i*t + 0.5*g*t^2

Subs the values:

-2 = 0 + V*sin(30)*75/V*cos(30) - 4.905*(75/Vcos(30))^2

-2 = 75*tan(30) - 4.905*(5625/V^2*cos^2(30))

V^2 = 4.905*5625 / (2 + 75*tan(30))*cos^2(30)

V^2 = 812.0633

V = 28.5 m/s

- Use the third equation of motion in the interval of the throw:

V^2 = U^2 + 2*a*s_a

28.5^2 = 2*a*0.7

a = 580 m/s^2

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3 years ago

A rod attracts a positively charged hanging ball. the rod is?a) negativeb) positivec) neutrald) either negative or neutrale) eit

makvit [3.9K]

Answer:

The correct option is a

Explanation:

This question seeks to test a general rule in physics (on charges) which states that <u>like charges repel but unlike charges attract</u>. This means that, a negatively charged substance will repel or not attract another negatively charged material and the same applies to a positively charged substance also. However, a <u>negatively charged substance will attract a positively charged material and vice versa,</u> hence only a negatively charged rod will attract a positively charged hanging ball.

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photoshop1234 [79]

Answer:

It burns easily & It produces a lot of energy

Explanation:

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malfutka [58]

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