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2 years ago

Lil' Ricky is trying on his Halloween costume in front of a flat (plane) mirror. Lil Ricky stands 1.5 m from the mirror.

Physics

1 answer:

Flura [38]2 years ago

3 0

Answer:

The correct answer is A) It is upright and 1.5m behind the mirror

Explanation:

Your reflection must be upright, meaning vertical/erect, and the distance will be the exact same. Also, the reflected ray appears as if it had traveled from an object located behind the mirror.

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One way to measure g on another planet or moon by remote sensing is to measure how long it takes an object to fall a given dista

givi [52]

Answer:

a) $a=2.24m/s^{2}$

b) $v(t)=7.1m/s$

Explanation:

We use the kinematics equations:

$v(t)=v_{o}+g*t=g*t$ starting from rest

$y(t)=v_{o}t+1/2*a*t^{2}=1/2*a*t^{2$

$a=2*y/t^{2}=2*11.26/3.17^{2}=2.24m/s^{2}$

We find now the speed

$v(t)=a*t=2.24*3.17=7.1m/s$

7 0

2 years ago

A 75-hp compressor in a facility that operates at full load for 2500 h a year is powered by an electric motor that has an effici

stealth61 [152]

Answer:

$C = 16544.35\, USD$

Explanation:

The annual electricity cost is:

$C = (\frac{1}{0.93} )\cdot(75\, h.p.)\cdot(0.746\, kW)\cdot(2500\,h)\cdot(\frac{3600\,s}{1\,h} )\cdot(\frac{1\,kWh}{3600\,kJ} )\cdot (0.11\,\frac{USD}{kWh} )$

$C = 16544.35\, USD$

3 0

3 years ago

In an automobile collision, a 44-kilogram passenger moving at 15 meters per second is brought to rest by an air bag during a 0.1

const2013 [10]

Answer:

6,600N

Explanation:

According to second law of motion, Force = mass × acceleration

If acceleration = change in velocity/time = 15/0.10

Acceleration = 150m/s²

Given mass = 44kg

Force = 44× 150

Force = 6,600N

Magnitude of the average force exerted on the passenger during this time is 6,600N

8 0

3 years ago

A 800hz tuning fork is vibrating, producing a sound wave in the air.

blsea [12.9K]

Answer:

The frequency of the sound wave is 800Hz

The speed of sound in a is about 340m/s.

Velocity = frequency x wavelength

making wavelength the subject formula

wavelength = Velocity/frequency.

wavelength = 340/800

wavelength = 0.425m.

3 0

1 year ago

Why the effect of gravitational force is more in liquid than in solid?

LekaFEV [45]

Gravitational force depends only on mass and distance, not on the state of matter.
The forces of attraction between molecules in matter are electromagnetic in nature, not gravitational.
These attractive forces are stronger in a solid than in a liquid than in a gas.
Gravitational forces between molecules is completely negligible compared to the em forces.

So, key answer is inter-molecular forces of solids is stronger than liquids.

4 0

3 years ago

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