Answer:
65.14 g
Explanation:
The change in the entropy of two ,metals on mixing is
Here, R is real gas constant, n_{cu} is the number of moles of the copper, and n_{Ni} is the number of moles of nickel
Thus the number of moles of Nickel is
=1.7 moles
now put n_{Ni} = 1.7 ΔS= 15,
R= 8.314 and solve
On solving the number of moles of copper in the mixture
n_cu= 1.025
Thus the mass of copper is = n_cu×M_cu = 1.025×63.55 = 65.14 g
Therefore the required mass is = 65.14 g
The correct answer is A car travels South for 5 miles, turns around, and travels North for 8 miles.
Explanation:
Displacement is determined by the change in position. This means there is displacement if the initial position of a body such as a car is different from the final position. Also, the displacement is considered in terms of direction (North, South, East, West). In this context, if a car travels South or North and then returns to its initial position there is no displacement.
According to this, the only option that shows a displacement North is "A car travels South for 5 miles, turns around and travels North for 8 miles" because in this case, the car had a change in position as it first moved 5 miles south (a displacement of 5 miles South) and then 8 miles north, which changes the displacement to 3 miles North (5 miles South - 8 miles North = 3 miles North).
Data:
Vo = 120 ft / s
α = 30°
t = 5 s
x = ?
Formulas:
cos(α) = Vo,x / Vo => Vo,x = Vo * cos(α)
x = Vo,x * t
Calculations:
Vo,x = 120 ft / s * cos(30) = 103.92 ft /s
x = 103.92 ft/s * 5 s = 519.6 ft
Answer: 519.6 ft
Answer:
a= 0.5m/s^2
Explanation:
Force applied on an object is known as
F=m.a (Newton's second law states it)
a=F/m
a=5/10=0.5m/s^2
Answer:
Force exerted = 25.41 kN
Explanation:
We have equation of motion
v² = u²+2as
u = 345 m/s, s = 8.9 cm = 0.089 m, v = 0 m/s
0² = 345²+2 x a x 0.089
a = -668679.78 m/s²
Force exerted = Mass x Acceleration
Mass of bullet = 38 g = 0.038 kg
Acceleration = 668679.78 m/s²
Force exerted = 25409.83 N = 25.41 kN