Answer:
5 watts
power = work done ÷ time taken
10 j ÷ 2 = 5w
Answer:
118 N
Explanation:
Given mass of the block, m = 4.00kg.
The acceleration of the elevator, a = 3.0 m/s^2.
As elevotar attaced with spring scale and accelerating upward
(block and elevator), so total force
![F_N-mg=ma](https://tex.z-dn.net/?f=F_N-mg%3Dma)
Here, mg is the weight of the block downward direction.
or
![F_N=ma+mg=m(g+a)](https://tex.z-dn.net/?f=F_N%3Dma%2Bmg%3Dm%28g%2Ba%29)
substitute the given value, we get
![F_N=4kg(9.8m/s^2+3m/s^2)](https://tex.z-dn.net/?f=F_N%3D4kg%289.8m%2Fs%5E2%2B3m%2Fs%5E2%29)
= 117.6 N = 118 N.
Thus, the reading on the spring scale to 3 significant figures is 118 N.
Answer:
I think its oxygen, a conductor is something that allows heat very easily.
Explanation:
Please mark brainliest and have a great day!
A complex entity involving the Earth's biosphere, atmosphere, oceans, and soil; the totality constituting a feedback or cybernetic system which seeks an optimal physical and chemical environment for life on this planet
Answer:
wave length is 1.2m
Explanation:
since formula of wave length is v/f
v(speed of sound in air at stp is 300ms^-1)
f(frequency 250hertz)
then wave length is 300÷250 which give 1.2m