Answer:
7.99 × 10⁸ atoms
Explanation:
The diameter of Molybdenum atom is 418pm = 0.000000000418m
therefore to determine number of Mo Atoms that'll be required =
0.334 ÷ 0.000000000418 = 7.99 × 10⁸ atoms
Mass of one Mo atom = 1.59×10⁻²² g
Mass of 7.99 × 10⁸ atoms that'll be required = 1.59×10⁻²² × 7.99 × 10⁸ =
12.7041 × 10⁻¹³g.
Answer:
F = 4000 N
Explanation:
given,
mass of rocket (M)= 5000 Kg
10 Kg gas burns at speed (m)= 4000 m/s
time = 10 s
average force = ?
at the end the rocket is at rest
by conservation of momentum
M v + m v' = 0
5000 x v - 10 x 4000 = 0
5000 v = 40000
v = 8 m/s
speed of rocket = 8 m/s
now,
we know
change in momentum = F x Δ t
F = 4000 N
Hence, the average force applied to the rocket is equal to F = 4000 N
I believe it’s A, i could be wrong tho 3
Answer:
101.32 rounded to 1 significant figure is 100. 20.1234 rounded to one significant figure is 20, and 212.1 rounded to one significant figure is 200.
100 + 20 is 120, and 120 - 200 is -80.
Explanation:
Answer: The current required will be of 1.25 Ampere.
Explanation:
Voltage of one battery= 1.5 Volts
Voltage required by DVD player to operate, V = 6 × 1.5 = 9 Volts
Resistance offered by the device, R = 7.2 Ohms
V = IR (Ohm's law)
The current required will be of 1.25 Ampere.