We can only see the "Visible region" of Electromagnetic spectrum
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Answer:
Work=1800 J
Speed=3m/s
Explanation:
Work is product of force and distance moved, expressed as
W=Fd
Where F is force and d is distance in meters
Substituting 300 N for force and 6 m for d then
W=300*6=1800 J
Kinetic energy is given by
KE=½mv²
Where m is the mass and v is velocity
Here, KE=W hence
W=½mv²
Making v the subject then
Substituting 1800J for W and 400 kg for m then
Therefore, velocity is 3 m/s
Nature has place jewels and gold and diamonds into caves deep into the earth , this is how nature has hidden gold form almost everything.
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Answer:
- the iron + boat system displaces more volume than the iron alone
- the system is the iron alone, it displaces the same volume in the boat and the water
Explanation:
The Archimedes principle states that the thrust is equal to the weight of the dislodged liquid.
B = ρ g V
Let us analyze this case the weight of the iron is the same either in the boat or at the bottom of the sea, but the volume that moves from water is greater when it is in the boat, it is already the area of the boat that moves the water, whereby the iron and the boat does not sink.
When the iron is on the surface of the water in displaced volume it is in the iron (V_Iron << V_boat), so in the relation
B- W = m a
The weight of the iron is greater than the thrust and it sinks
two posibilities
Therefore, the iron + boat system displaces more volume than the iron alone
If the system is the iron alone, it displaces the same volume in the boat and the water
Answer:
See below
Explanation:
KE = 1/2 m v^2 = 1/2 *6 * 32.5^2 = 3168.75 j
PE = mgh = KE at end = 3168.75 j
ME = 3168.75 j
ME is KE + PE at any point
before it falls it has no KE before it hits it has no PE
so ME = 3168.75 j