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WARRIOR [948]
3 years ago
6

A pendulum on a grandfather clock

Physics
1 answer:
egoroff_w [7]3 years ago
5 0
4.0 ilynits per second Alaskan es muy du facial in the oscillates 1.99
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In object of mass 30 kg is in freefall in a vacuum where there is no air resistance determine the acceleration of the object
Leto [7]
The free fall acceleration due to the Earth's gravity will always be 9.8m/s^2. So, if this question is taking place on Earth, then the acceleration of an object in free fall is 9.8m/^2.
3 0
3 years ago
Describe how sound waves are produced by the drum and then heard.
Tamiku [17]

Answer:

The material stretched across the drum vibrates to produce the sound waves.

Explanation:

A drum is one of the oldest musical instrument made by man. It is made of a hollow body over which a material such as skin is stretched. When a drum is struck with a stick, the material vibrates up and down. This makes the air above the drum to contract and relax rhythmically resulting in soundwaves. The soundwaves travel through air to reach our ears where they are heard.

The quality of sound produced by  a drum is affected by its shape. A larger drum produces a lower pitched sound.

4 0
3 years ago
4. AN OBJECT INCREASES ITS VELOCITY
Cloud [144]

Answer:

it is accelerating 14 m/s

Explanation:

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3 years ago
why do signs at petrol stations warn people not to use cell phones while filling the petrol in their cars?​
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Cell phones may be radioactive.Maybe this is the reason???.
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3 years ago
A pickup truck is traveling down the highway at a steady speed of 30.1 m/s. The truck has a drag coefficient of 0.45 and a cross
Sav [38]

Answer:

The energy that the truck lose to air resistance per hour is 87.47MJ

Explanation:

To solve this exercise it is necessary to compile the concepts of kinetic energy because of the drag force given in aerodynamic bodies. According to the theory we know that the drag force is defined by

F_D=\frac{1}{2}\rhoC_dAV^2

Our values are:

V=30.1m/s

C_d=0.45

A=3.3m^2

\rho=1.2kg/m^3

Replacing,

F_D=\frac{1}{2}(1.2)(0.45)(3.3)(30.1)^2

F_D=807.25N

We need calculate now the energy lost through a time T, then,

W = F_D d

But we know that d is equal to

d=vt

Where

v is the velocity and t the time. However the time is given in seconds but for this problem we need the time in hours, so,

W=(807.25N)(30.1m/s)(3600s/1hr)

W=87.47*10^6J (per hour)

Therefore the energy that the truck lose to air resistance per hour is 87.47MJ

4 0
3 years ago
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