The lenses on a camera focus the light entering the camera and provide a clear, sharp image at the location of the film or CCD device. If you took the lenses off a camera designed for use with lenses, you would not be able to create a usable image.
Answer: C) velocity is a vector and requires a direction.
Explanation:
In physics, there are two types of quantities:
- scalars: these are quantities that have only a magnitude
- vectors: there are quantities that have both magnitude and direction
As an example, speed is a scalar while velocity is a vector. Therefore, speed has only a magnitude, while velocity has both magnitude and direction: therefore, the difference between the two quantities is that velocity is a vector and requires a direction, as stated in option C.
The answer is:
Heat from the ankle is transferred to the ice pack.
The explanation:
-when the ice pack a lower temp than the ankle , it is very cool.
- and the injured ankle has a high temp or heat
and we know that Q transfer from the object with high heat to the object with the low temp So,
Heat will transfer from the ankle to the ice pack.
Explanation:
It is given that,
Momentum of the photon, 
(a) We need to find the wavelength of this photon. It can be calculated using the concept of De-broglie wavelength.
h is the Planck's constant
or
(b) The wavelength lies in the group of ultraviolet rays. The wavelength of UV rays lies in between 400 nm to 10 nm.
Average speed = (total distance covered) / (time to cover the distance)
Ian's total distance = (2km + 0.5km + 2.5km) = 5 km
Ian's total time = 3 hours
Average speed = (5km) / (3 hours)
Average speed = 1.66 km/hr
