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3 years ago

I've been getting this question wrong and i still don't know it.

Physics

2 answers:

Diano4ka-milaya [45]3 years ago

8 0

Answer:

the answer is B - He can use the laser to point to specific information on the slides.

Explanation:

laser pointers are used and its on edge

RideAnS [48]3 years ago

7 0

Answer: Option (A) is the correct answer.

Explanation:

Laser helps in zooming an image on which it is directed or falls so that it becomes easier for a large population to understand what the teacher or guide is talking about.

For example, when Greg is giving slide show presentation to a large audience then in order to make his slides visualized by everyone in the room he uses laser.

Therefore, we can conclude that a laser best help him with the presentation as he can use the laser to enlarge images on the slides.

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3 years ago

An elevator ascends at a constant speed of 4 m/s. How much time is required for the elevator in order to travel 200m upwards?

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3 years ago

What are the physical characteristics of sound waves

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4 years ago

The resistance of the light bulb changed as the voltage (and current) changed. Why does this resistance change occur?

Murrr4er [49]

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3 years ago

Mickey, a daredevil mouse of mass 0.0227 kg,0.0227 kg, is attempting to become the world's first "mouse cannonball." He is loade

Viefleur [7K]

Answer:

1.65 m

Explanation:

Energy from spring, $E_{s}$ is given by

$E_{s}=0.5kx^{2}$ where k is spring constant and x is the compression distance

$E_{s}=0.5*51.1*0.129^{2}= 0.425178$

$E_{s}=0.425 J$

Kinetic energy, KE at the highest point is given by

$KE=0.5mv^{2}$ where m is mass and v is velocity

KE=0.5*0.0227*2.27= 0.058485 J

Potential energy, PE of spring is given by

PE=mgh where g is gravitational constant and h is maximum height reached by the mouse

PE=0.0227*9.81= 0.222687h

According to the principle of conservation of energy, the potential energy of the compressed spring is equal to the potential and kinetic energy of the mouse at the maximum high point.

$E_{s}=PE+KE$

0.425=0.222687h+0.058485

h=(0.425-0.058485)/ 0.222687=1.646671 m

h=1.65 m

7 0

3 years ago