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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 decagram is 1000 times bigger than a centigram
8 0
3 years ago
The opening to a cave is a tall, 30-cm-wide crack. A bat that is preparing to leave the cave emits a 30 kHz ultrasonic chirp. Ho
sweet-ann [11.9K]

Answer:

Width of sound beam is 7.557 m

Explanation:

First we will calculate the wave length from given data:

λ=v/f

Were:

v is the speed

f is the frequency

\lambda=\frac{340}{30*10^3}\\ \lambda=0.01133 m

We considered the opening long and narrow, Using single slit diffraction formula:

mλ=dsinΘ

where:

d is the crack width

m is the order

Θ is angle

Considering m=1, The angle between first minimum from center of beam is:

\theta=sin^{-1}(\frac{m\lambda}{d})\\\theta=sin^{-1}(\frac{1*0.01133}{30*10^{-2}})\\ \theta=2.164^o

The width of beam is:

tanΘ=y/L

tan\theta=\frac{w/2}{L}\\ w=2L\ tan\theta\\w=2*100*tan 2.164\\w=7.557 m

Width=7.557 m

5 0
2 years ago
In the United States, most of our energy comes from this non–renewable resource, which has a negative effect on the environment.
Eduardwww [97]
All of them have a negative effect on the environment. 
But your answer would be Natural Gas being the leading source of energy in the US by 31% overall. 
8 0
3 years ago
What type of wave is a sound wave
Yanka [14]
Hey there!
A sound wave is a<u> longitudinal wave</u>, meaning that the motion of the particles of the wave is parallel to the direction of the motion of the wave.
Hope this helps!
5 0
2 years ago
Read 2 more answers
I would like to know why this is the correct answer
Helen [10]

The acceleration of the object if the net force is decreased = 0.13 m/s²

<h3>Further explanation</h3>

Given

A net force of 0.8 N acting on a 1.5-kg mass.

The net force is decreased to 0.2 N

Required

The acceleration of the object if the net force is decreased

Solution

Newton's 2nd law :

\tt \sum F=m.a

The mass used in state 1 and 2 remains the same, at 1.5 kg

  • state 1

ΣF=0.8 N

m=1.5 kg

The acceleration, a:

\tt a=\dfrac{\sum F}{m}\\\\a=\dfrac{0.8}{1.5}\\\\a=0.53`m/s^2

  • state 2

ΣF=0.2 N

m=1.5 kg

The acceleration, a:

\tt a=\dfrac{\sum F}{m}\\\\a=\dfrac{0.2}{1.5}\\\\a=0.13~m/s^2

8 0
2 years ago
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