PHYSICS HIGH SCHOOL

A fastball pitcher can throw a baseball at a speed of 40 m/s (90 mi/h). (a) Assuming the pitcher can release the ball 16.7 m from home plate so the ball is moving horizontally, how long does it take the ball to reach home plate? (b) How far does the ball drop between the pitcher’s hand and home plate?

Answers

Answer 1

Answer:

Answer:

a) 0.4175 seconds

b) 0.854 m

Explanation:

t = Time taken

u = Initial velocity = 40 m/s in x direction

v = Final velocity

s = Displacement = 16.7 m

a = Acceleration due to gravity = 9.81 m/s²

a) Time = Distance / Speed

$\text{Time}=(16.7)/(40)=0.4175\ s$

Time taken by the ball to reach home plate is 0.4175 seconds

b) Here velocity will by taken in y direction will be 0

$s=ut+(1)/(2)at^2\n\Rightarrow s=0* 0.4175+(1)/(2)* 9.81* 0.4175^2\n\Rightarrow s=0.854\ m$

The ball drops by 0.854 m between the pitcher’s hand and home plate.

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An electromagnet is a device in which moving electric charges (current) in a coil of wire create a magnet. What’s one advantage of using electromagnets in devices? A Electromagnets have a strong, constant magnetic field. B Electromagnets are more powerful than permanent magnets. C Electromagnets don’t need a source of electricity to work. D Electromagnets can easily be turned on and off.

Answers

The electromagnet can be adjusted for having different levels of magnetic fields by turning it on and off. Hence, option (D) is correct.

What is an Electromagnet?

Electromagnets are made by winding a wire through a magnetic material such as a soft iron core making a coil and then passing an electric current through the coil thus making the soft iron core magnetic.

The characteristics of electromagnets are as follows -

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Permanent or regular magnets on the other hand do not require power but depend on the type of material used to make it.
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Thus, we can conclude that the electromagnet can be adjusted for having different levels of magnetic fields by turning it on and off. Hence, option (D) is correct.

Learn more about the Electromagnets here:

brainly.com/question/13803241

Answer;

D Electromagnets can easily be turned on and off.

Explanation;

Electromagnets are made by winding a wire through a magnetic material such as soft iron core making a coil, and then passing electric current through the coil thus making the soft iron core magnetic.
The strength of the electromagnet depends on the number of coils and also the size of the electric current through the coil.
Permanent or regular magnets on the other hand do not require power but depends on the type of material used to make it.
Therefore, its advantageous to use electromagnets as compared to using permanent magnets since the strength of the electromagnet can be easily adjusted by regulating the amount of current flowing through the coils. Thus, the electromagnet can be adjusted for have different levels of magnetic fields.

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Answers

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Answers

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Answers

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