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Ganezh [65]
3 years ago
15

"An elevator is moving upward with a speed of 11 m/s. Three seconds later, the elevator is still moving upward, but its speed ha

s been reduced to 5.0 m/s. What is the average acceleration of the elevator during the 3.0 s interval?
Physics
1 answer:
ehidna [41]3 years ago
5 0

Answer:

Average acceleration = - 2 m/s^2

Explanation:

Given data:

Initial velocity = 11 m/s

Final velocity = 5.0 m/s

duration of change in velocity = 3 sec

Average acceleration = \frac{v - u}{\Delta t}

Average acceleration = \frac{5 - 11}{3} = -2 m/s^2

Average acceleration = - 2 m/s^2

here negative sign indicate that acceleration is proceed in downward direction.

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A 200g(m2) mass is pulling the cart (m1) across the table as shown below. If it covers 1.12m in 4.8 seconds starting from rest,
Vsevolod [243]

Answer: 20.21 kg

Explanation:

The mass hanging from the pulley is pulling the cart. The force by which cart is being pulled is equal to weight of the hanging mass.

F=m_2g

⇒F=0.200 kg ×9.8 m/s²=1.96 N

Since there is no other force acting on the cart and there is no friction, so this force will pull the cart.

The Cart covers 1.12 m distance in 4.8 s.

From the equation of motion,

s = u t + 0.5 × a t²

We will find the acceleration of the cart,

Distance covered, s = 1.12 m

Initial velocity, u = 0 ( staring from rest)

Time taken, t = 4.8 s

⇒1.12 m = 0 + 0.5 × a × (4.8 s)²

⇒a = 0.097 m/s²

Now the force which causes this acceleration is:

F = ma

where m is the mass of the cart and a is the acceleration of the cart

⇒1.96 N = m×0.097 m/s²

⇒m = 20.21 kg

Hence, the mass of the cart is 20.21 kg.


4 0
3 years ago
If you hear thunder 5 seconds after you see a lightning bolt how far is the storm
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I think the answer is 3 miles because its storming now where I live

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natali 33 [55]
300/8 = 37.5
37.5 x 12 = 450
New temp. = 450 K
Hope this helps!
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3 years ago
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