Answer:
True
Explanation:
If it is at right conditions and correct time (night time most likely) they will all be visible
Answer:
the ball is rolling 7m/s
Explanation:
Formula for kinetic energy: 1/2mv²
K = 1/2mv²
98 = 1/2(4)v²
98 = 2v²
49 = v²
√49 = v
7 = v
<h3>
Answer: A) 3 pronged cord</h3>
Explanation:
One prong is known as the hot wire, where the electricity comes in, while the second prong is the neutral wire and electricity leaves. Recall that a circuit must be made for electrons to flow. This means that electrons enters your house through the transmission wires and then the electrons leave along the same lines they entered (just along a different wire).
This set up describes a 2 pronged cord. Adding a third prong allows for a grounding to happen. In the event of an electrical surge, when too many electrons are flowing, disaster is likely to happen without some kind of safety features. The grounding prong allows electrons to seek the ground. You can think of it like a drain in a bathtub when too much water gets in the tub.
Answer:
Type of steels and their uses :
Type Carbon percentage uses
Low carbon steel 0.1% to 0.3 % Food cans ,car body ,nut & bolt.
Medium carbon steel 0.3% to 0.70 % Metal chains ,wheel rims,wire ropes
High carbon steel 0.7% to 1.3% Hammers,drills ,dies and taps.
High speed steel 0.6 % Cutting tools in lathe machine.
Type Properties
Low carbon steel - Fairly strong and easily get rusty
Medium carbon steel - Having high hardness than low carbon steel
High carbon steel - Having high hardness than medium carbon steel
High speed steel - Harder ,can retain its shape at high temperature
Answer:
Explanation:
Given that,
The speed of an electron, 
We need to find the wavelength of this electron. It can be calculated using De -broglie wavelength concept as :
h is the Planck's constant
So, the wavelength of the electron is 
. Hence, this is the required solution.
