Answer:
10.9 m
Explanation:
We can solve the problem by using the law of conservation of energy.
The initial mechanical energy is just the kinetic energy of the ball:
where m is the mass of the ball and u = 16.9 m/s the initial speed.
At a height of h, the total mechanical energy is sum of kinetic energy and gravitational potential energy:
where v is the new speed, g is the gravitational acceleration, h is the height of the ball.
Due to the conservation of energy,
(1)
Here, at a height of h we want the speed to be 1/2 of the initial speed, so
So (1) becomes
So we can find h:
Answer:
26.17 V
Explanation:
In a alternator , an ac voltage is produced whose magnitude of voltage varies sinusoidally.
Maximum voltage induced = nBAω
where n is no of turns , B is magnetic field , A is area of the coil and ω is angular velocity .
Rate of rotation n = 1000rpm = 1000/60 rps = 16.67 rps
angular velocity ω = 2π n = 2π x 16.67 = 104.68 rad / s
Putting all values in the given equation above
Max voltage = 250 x .1 x .01 x 104.68
= 26.17 V
The answer is the last option.
Answer:
The crystalline structure of a mineral consist of the solid form of how atoms, molecules, or ions arranged and arranged by a regular and repetitive geometric pattern are arranged and packaged
.
Explanation:
In some rocks, especially in crystalline rocks - such as plutonites and metamorphites - minerals have crystal faces which are smooth surfaces limited by certain angles. These smooth planes often correspond to planes of their crystal lattice and therefore reflect the crystal structure of the crystal.
In a micacite of mica and garnet, for example, garnets often crystallize in their own way, he says that all the outer planes of garnets correspond to planes of his crystalline net: garnets are idiomorphic.
In a granite or a granodiorite, for example, alkaline plagioclase and feldspars are limited, limited by some planes of the glass and some irregularly shaped planes: the plagioclase and alkaline feldspars of the granites are 'hypidiomorphs'.
In other rocks, for example, in sandstones, minerals do not have faces of crystals, but do form fragments or clasts.
Answer:
Distance - 1000m
Time - 20min
Speed - ?
Use the formula of distance ÷ time = speed.
s = d/t
s = 1000m/20min
s = 50 m/min
Hope this helps, thank you !!