Answer:
0.9 N
Explanation:
The electric force acting on a charge is given by:
where
q is the magnitude of the charge
E is the strength of the electric field
In this problem, we have
is the charge
is the strength of the electric field
Substituting into the equation, we find
Answer:
Approximately . (Assuming that this table is level, and that the gravitational field strength is .
Explanation:
Convert the dimensions of this book to standard units:
.
.
Calculate the surface area of this book:
.
Pressure is the ratio between normal force and the area over which this force is applied.
.
Equivalently:
.
In this question, .
It was found that (assuming that the entire side of this book is in contact with the table.
Hence:
.
If that the table is level, this normal force would be equal to the weight of this book:
.
Assuming that the gravitational field strength is . The mass of this book would be:
.
What causes the ballon to fly away is the air pushing out of the balloon also tied in with air pressure
Answer:
v = 18.5 m /s
Explanation:
The velocity of the jumper will go on increasing until his weight is more than the restoring force created in the bungle.
mg = kx
50 x 9.8 = 100 X
X = 4.9 m
Total fall = 15 + 4.9 = 19.9 m
kinetic energy gained due to fall by 19.9 m
= mgh = 50 x 9.8 x 19.9 = 9751 J
energy lost due to stored elastic energy in bungie
= 1/2 k x²
= .5 x 100 x 4.9²
= 1200.5 J
Remaining kinetic energy = 9751 - 1200.5 = 8550.5 J
1/2 m v² = 8550.5
.5 x 50 x v² = 8550.5
v² = 342
v = 18.5 m /s
Answer:<span>Humid air is lighter, so it has lower pressure.
The reason is the molecules of water are H2O, whose molar mass is 18 g/mol.
These molecules displaces molecules of N2 and O2, whose molar masses are:
N2: 2*14g/mol = 28 g/mol, and
O2: 2*16g/mol = 32 g/mol.
Then molecules of 28g/mol and 32 g/mol are being replaced with molecules of 18g/mol, leading to a lower weight of the same volume of air, which results in lower pressure.
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