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3 years ago

A heavy object is dropped From a vertical height of 8.0 m. What is it’s spend when it hits the ground ?

Physics

1 answer:

otez555 [7]3 years ago

4 0

Answer:

Final speed of the ball = Vf= 12.52 m/s when it hits the ground

Explanation:

Height = S= 8.0 m

Initial Velocity= Vi = 0 m/s

Final Velocity= Vf =?

Acceleration due to gravity= a=9.8m/s²

Using Newtons third equation of motion

2as= Vf²- Vi²

2(9.8) 8= Vf²- 0

156.8= Vf²

Vf=√156.8= 12.52m/s

Final Speed of the ball is 12.52 m/s

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3 years ago

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4 years ago

How much electrical energy is used by a 400 W toaster that is operating for 5 minutes?

Shkiper50 [21]

The electrical energy consumed by a toaster is 0.033 Kwh.

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The power utilized by the toaster is 400 W.

$\text { The power utilized by the toaster is } 400 \mathrm{W} \text { in kilo-watts is } \frac{400}{1000}=0.4 \mathrm{Kw}$

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3 years ago

A 310-g air track cart is traveling at 1.25 m/s and a 260-g cart traveling in the opposite direction at 1.33 m/s. What is the sp

UNO [17]

Answer:

$v_{CM}=0.0732\ m/s$

Explanation:

given,

mass of the cart 1, m₁ = 310 g

speed of car 1 , v₁ = 1.25 m/s

mass of cart 2, m₂ = 260 g

speed of cart 2, v₂ = -1.33 m/s

speed of center of mass

$v_{CM}=\dfrac{m_1v_1 + m_2 v_2}{m_1 + m_2}$

$v_{CM}=\dfrac{0.31\times 1.25 +0.26\times (-1.33)}{0.31+0.26}$

$v_{CM}=\dfrac{0.0417}{0.57}$

$v_{CM}=0.0732\ m/s$

Hence, speed of center of mass of the system is equal to 0.0732 m/s

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4 years ago