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3 years ago

What does “use f=ma, where a=v-u divided by t”mean

Physics

1 answer:

m_a_m_a [10]3 years ago

4 0

$f = m( \frac{v - u}{t} )$

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When an object loses electrons, it acquires a(n) ____________________ electric charge?

madam [21]

It acquires a positive electric charge.

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3 years ago

An artificial satellite is moving in a circular orbit of radius 24,600 km. Calculate its speed if it takes 12hours to revolve ar

denis-greek [22]

Answer:

the speed of the satellite is 12,880.53 km/h

Explanation:

Given;

radius of the circular orbit, r = 24,600 km

time taken to revolve around Earth, t = 12 hours

The circumference of the satellite is calculated as;

L = 2πr

L = 2π x 24,600 km

L = 49,200π km

L = 154,566.36 km

The speed of the satellite;

v = L/t

v = 154,566.36 / 12

v = 12,880.53 km/h

Therefore, the speed of the satellite is 12,880.53 km/h

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3 years ago

When an object is moving with uniform circular motion, the centripetal acceleration of the object a. is circular. b. is perpendi

koban [17]

When an object is moving with uniform circular motion, the centripetal acceleration of the object d. is directed toward the center of motion.

7 0

3 years ago

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List the following items in order of decreasing speed, from greatest to least: (i) A wind-up toy car that moves 0.15 m in 2.5 s.

a_sh-v [17]

Answer:

(iii) > (ii) > (iv) > (i)

Explanation:

Part (i):

$\textrm{Speed of the wind-up toy} = \dfrac{\textrm{distance traveled}}{\textrm{Time taken}}\\\Rightarrow v_1=\dfrac{0.15\ m}{2.5\ s}\\\Rightarrow v_1 = 0.06\ m/s$

Part (ii):

$\textrm{Speed of the soccer ball} = \dfrac{\textrm{distance traveled}}{\textrm{Time taken}}\\\Rightarrow v_2=\dfrac{2.3\ m}{0.55\ s}\\\Rightarrow v_2 = 4.18\ m/s$

Part (iii):

$\textrm{Speed of the bicycle} = \dfrac{\textrm{distance traveled}}{\textrm{Time taken}}\\\Rightarrow v_3=\dfrac{0.66\ m}{0.075\ s}\\\Rightarrow v_3 = 8.8\ m/s$

Part (iv):

$\textrm{Speed of the cat} = \dfrac{\textrm{distance traveled}}{\textrm{Time taken}}\\\Rightarrow v_4=\dfrac{8.0\ m}{2.0\ s}\\\Rightarrow v_4 = 4.0\ m/s$

From the above calculations, we have

$v_3>v_2>v_4>v_1$

So, the speed in the parts mentioned arranged in decreasing order as follow:

(iii) > (ii) > (iv) > (i)

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3 years ago

What causes light to refract

Anestetic [448]

The light passes from one medium to another

3 0

3 years ago

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