Answer:
Explanation:
This does not violate Newton's 1st law because the net force would still be 0 in order to produce uniform motion (aka constant velocity). The other forces acting on the vehicles is air resistance which is non-zero. So we need car internal force to counter balance this force, which require extra gas for the car.
Answer:
No image will be observed.
Explanation:
Images that are created by mirrors are virtual images. This virtual image can only be seen by an observer. In this case, an infinite number of images or no image will be created here as both will be reflecting their own images. Light will continuously bounce back and forth reflecting the same image.
Answer:
Internal resistance = 0.545 ohm
Explanation:
As per ohm's law we know that

here we know that
i = electric current = 2.75 A
V = potential difference = 1.50 Volts
now from above equation we have

now we have


Speed of sound in cold air, speed of sound in warm air, speed of sound in steel speed of sound in water, and speed of sound in hot molten lead
Wavelength is the length from one peak of a wave to the next, while frequency is the amount of waves present in a unit of time. The greater the wavelength the smaller the frequency. The smaller the wavelength, the bigger the frequency.