Answer:
23895.05 Pa
Explanation:
V = 0.03 m³
mass, m = 4 g
Temperature, T = 388 K
Let P be the pressure.
number of moles, n = 4 / 18 = 0.22
Use ideal gas equation
PV = n RT
P x 0.03 = 0.22 x 8.314 x 388
P = 23895.05 Pa
Thus, the pressure is 23895.05 Pa.
Answer:1) Via heat: ferromagnet materials will lose their magnetism if heated above a point known as the Curie temperature. ... With a strong enough magnetic field of opposite polarity, it is therefore possible to demagnetize the magnet [whether this comes from another permanent magnet, or a solenoid].
Explanation:Unlike permanent magnets, temporary magnets cannot remain magnetized on their own. Soft magnetic materials like iron and nickel will not attract paper clips after a strong external magnetic field has been removed.To restore a permanent magnet, you need to cool the metal (if heated) and expose it to a magnetic field. Coil your copper wire tightly around the piece of metal you would like to restore as a permanent magnet.
Answer:
a magnet and sifter
Explanation:
a magnet will get all the iron filling and the sifter will separate the powder and sand
Stretching a spring. anything that will portion out the stretched energy
Answer:
d = 220 m (2 s.d.)
Explanation:
If the arrow flies over a horizontal plain and air resistance is ignored.
The time of flight is twice the time that gravity takes to reduce initial vertical velocity to zero
t = 2(47sin37)/9.8 = 5.7725... s
Range is the time of flight times the initial horizontal velocity.
d = (47cos37)5.77 = 216.676...