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algol13
3 years ago
12

Which source is most likely an authority on the subject? Dr. Vale, a pediatrician, discusses electrical circuitry on her home-im

provement website. Jonah, an amateur cook, teaches his son how to make the best grilled cheese sandwiches. Susan, an architect, presents her hand-made quilts at the Quilting Society. Dr. Patel, a cardiologist, presents her findings on heart disease.
Physics
2 answers:
Pavlova-9 [17]3 years ago
7 0

Answer:

D.

Explanation:

I took the quiz

Naddika [18.5K]3 years ago
6 0
The correct answer is Dr. Patel, a cardiologist, presents her findings on heart disease.

A cardiologist is a heart doctor, so he would be the highest authority to speak about heart disease. The others are all amateurs in their businesses.
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The metal ball lost energy while the putty ball gained energy.

<h3>What is momentum?</h3>

Momentum is the product of mass and velocity of the body. We must note that momentum before collision is equal to momentum after collision.

1) Kinetic energy before collision = 1/2mv^2 = 0.5 * 6 * 4 = 12 J

2) kinetic energy after collision = 0.5 * 6 *  2= 6 J

3) Kinetic energy of putty ball = 0.5 * 6 *  2= 6 J

4) Energy lost by the metal ball = 12 J -  6 J = 6 J

5) Energy gained by the putty ball = 6 J - 0J = 6 J

6) The rest of the energy was converted to heat after the collision.

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What would happen to mass and accelaration if the force on an object increases?? please help.
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At speeds over 30 mph, you should maintain a following distance of at least ________ behind the vehicle ahead of you.
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At speeds over 30 mph, you should maintain a following distance of at least <u>three full seconds</u> behind the vehicle ahead of you.

As a general rule and common sense at a speed of 30 mph you can leave three full seconds so that you can achieve a prudent distance between the car you are driving and the car in front in order to be able to perform some kind of maneuver if an accident or unforeseen event occurs.

To count the full three seconds you can use the technique of counting the Mississippis as follows: Mississippi one, Mississippi two, Mississippi three.

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An accident is an unexpected event that generally causes damage, injury or negative consequences.

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