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Komok [63]
2 years ago
7

An object that is completely or partially submerged in fluid experience an upward force called?​

Physics
1 answer:
romanna [79]2 years ago
8 0
The buoyant force or upward buoyancy force
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What is the frequency of a transverse wave ?​
yuradex [85]

Answer:

The number of complete vibration or wave made in

one second is called frequency.

7 0
3 years ago
The driver of a car going 86.0 km/h suddenly sees the lights of a barrier 44.0 m ahead. It takes the driver 0.75 s to apply the
Lynna [10]

Part a

Answer: NO

We need to calculate the distance traveled once the brakes are applied. Then we would compare the distance traveled and distance of the barrier.

Using the second equation of motion:

s=ut+0.5at^2

where s is the distance traveled, u is the initial velocity, t is the time taken and a is the acceleration.

It is given that, u=86.0 km/h=23.9 m/s, t=0.75 s, a=-10.0 m/s^2

\Rightarrow s=23.9 m/s \times 0.75s+0.5\times (-10.0 m/s^2)\times (0.75 s)^2=15.11 m

Since there is sufficient distance between position where car would stop and the barrier, the car would not hit it.

Part b

Answer: 29.6 m/s

The maximum distance that car can travel is s=44.0 m

The acceleration is same, a=-10.0 m/s^2

The final velocity, v=0

Using the third equation of motion, we can find the maximum initial velocity for car to not hit the barrier:

v^2-u^2=2as

0-u^2=-2 \time 10.0m/s^2 \times 44.0 m\Rightarrow u=\sqrt{880 m^2/s^2}=29.6 m/s

Hence, the maximum speed at which car can travel and not hit the barrier is 29.6 m/s.





7 0
3 years ago
Compare the amount of work done when one man uses an ideal pulley to lift a 500 newton weight 2 meters and one man lifts a 500 n
Liono4ka [1.6K]

More work is done when one man lifts the weight using a pulley. Option C is correct.

<h3>What is mechanical advantage ?</h3>

Mechanical advantage is a measure of the ratio of output force to input force in a system, it is used to obtained efficiency of  forces in levers and pulley.

It is an effective way of amplify the force in simple machines like lever  The theoretical mechanical advantage is defined as the ratio of the force responsible for the useful work in the system  to the applied force.

More work is done when one man lifts the weight using a pulley. With the pulley, the mechanical advantage is increasing.

Hence, option C is correct.

To learn more about the mechanical advantage, refer to the link;

brainly.com/question/7638820

#SPJ1

8 0
2 years ago
What happens when waves encounter a medium that they cannot travel through
Sophie [7]
Then the waves (and the energy they carry) are completely reflected from the surface of the impenetrable medium.

Example:
An ordinary mirror is a sheet of glass with a thin layer of aluminum
or silver stuck to the back of the glass.  Light waves have no trouble
traveling through the glass, but they can't get through the silver layer
on the back of it.  So the waves completely bounce off of the silver, and
go back through the glass in the direction they came from. 
4 0
3 years ago
How much work, in Joules, is required to stop a 1,168 kg car moving with a speed of 24 km/hr?
ANEK [815]
24km/hour=(20/3)m/s
Hence, W=1/2*1168kg*[(20/3)/m/s]^2=25955.56J

6 0
2 years ago
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