Answer:
2
Explanation:
length of the raft, L = 2 m
Width of the raft, W = 2.5 m
height of the raft, H = 9.8 cm = 0.098 m
mass of each person, m = 75 kg
Density of wood = 650 kg/m^3
volume of raft, V = L x W x H = 2 x 2.5 x 0.098 = 0.49 m^3
let there are N persons
According to the principle of floatation
Buoyant force acting on the raft = True weight of the raft
Volume x density of water x g = volume x density of wood x g + N x mg
0.49 x 1000 x g = 0.49 x 650 x g + N x 75 x g
490 = 318.5 + N x 75
N = 2.28
So, the maximum number of person is 2.
Answer:
1} Two 100 lb. tanks of Oxygen
2) Five gallons of water
3) Food concentrate
4) One case dehydrated milk
5) Solar-powered heater
6) Solar-powered receiver-transmitter
7} First aid kit
8) Box of matches
9) Stellar map
10) Magnetic compass
11) Two 45 caliber pistols
12) Signal flares
13) 50' of rope
14) Self-inflating life raft
15) Parachute silk
Answer:
Fluorine
Explanation:
Fluorine is the most reactive nonmetal on the periodic table. It is a halogen on the table, which is located in Group 17.
Hope this helps!
Answer:
They can generate potentials spontaneously because they have Unstable Membrane Potentials.
Explanation:
Autorythmic cells or Pacemaker cells are cells that provide Action potentials (electrical impulses) that starts off the cardiac cycle.
N:B This action potential is created spontaneously.
To explain further, the heart originate in specialized cardiac muscle cells, called autorhythmic cells, that can excite themselves and therefore are able to generate an action potential without external stimulation by nerve cells. And this sets the cardiac cycle i
(Pumping of the heart) into motion. (The pace maker potential)
The Autorhythmic cells create an action potential spontaneously
And this is possible because they have an UNSTABLE RESTING POTENTIAL that is continuously depolarizing, while it drifts slowly toward threshold. As Na+ ions enter the cell, the inner surface of the plasma membrane becomes less negative gradually, thus generating the pacemaker potential.