Among the elements in group 7A, the most reactive would be Fluorine. Fluorine is a major component of toothpaste, what we use to brush and clean our teeth with. It is so reactive that it cannot be contained in glass.
Answer:
vertical height = 5.1 meters
Explanation:
M = 4 kg
V = 10 m/s^2
Based on the law of conservation of energy, energy can be converted from one form to energy.
Calculate the kinetic energy of the skateboard.
Kinetic energy = 1/2 * (MV^2)
K.E = 1/2 * ( 4 * 10^2)
K.E 0.5 * 400
K.E = 200 Joules
According to conservation of energy, Kinetic Energy = Potential Energy = 20 joules
P.E = Mgh
200 = 4 * 9.8 * h
h = 200/ 39.2
h = 5.1 meters
Answer:
A. All cells come from pre-existing cells
Explanation:
Francesco Redi's experiments aimed to test spontaneous generation, where life could emerge from non-living things. His first round included two groups of jars with raw meat in it. He covered one group with a thin cloth, allowing only air to get in, and the other group was left open.
In the jars left open, he <u>noted maggots were present </u>and the one that was covered contained <u>no maggots. </u>
The results indicated that the maggots only formed because flies laid their eggs on it and maggots developed. He did note that some maggots developed on the cloth itself, but on the outside.
Thus, he contributed in disproving spontaneous generation by showing that maggots only developed from the eggs that flies laid. This supports that all cells come from pre-existing cells.
The bathroom scales showing a mass of 77 kg implies that 770 N of force is being applied on it.
620 N of that is by the virtue of weight of the man. The rest 150 N of force which amounts to an extra 150(62) = 2.4 m/s^2 of acceleration is being provided by the lift.
Since the man is applying more force than on the floor of the lift than he normally would have, we know the lift is accelerating upwards.
The acceleration of the lift = 2.4 m/s^2 upwards
Answer:
Because there is not a New Moon every month.
Explanation:
hope it helped!
