Answer:
Explanation:
Average speed = Total distance / Total time.
100 km/hr
r = 100 km / hr
t = 6 hours
d = 6 * 100 = 600 km
120 km / hr
r = 120 km / hr
t = 5 hour
d = 120 * 5
d = 600 km
Total distance = 600 + 600 = 1200 km
Total time = 5 hour + 6 hours = 11 hours.
Average speed = 1200 km / 11 hours = 109.1
Answer:
New moment of inertia will be 
Explanation:
It is given initially angular velocity 
Moment of inertia 
Angular momentum is equal to 
Now angular velocity is decreases to 
As we know that angular momentum is conserved
So 
So new moment of inertia will be
Energy change = -303050 J
Explanation:
the heat energy Q is given by the formula
Q= m C ΔT
m= mass of water=1.25 Kg
C= specific heat of water= 4180 J/Kg °C
ΔT= change in temperature =55-113= -58°C
Q= 1.25 (4180) (-58)
Q=-303050 J
Negative sign shows that the energy is released or lost.
Answer:
C) The densities of the samples are different, so a chemical reaction has occurred.
Explanation:
Given,
The volume of the sample A, v = 45 cm³
The mass of the sample A, m = 0.5 g
The volume of the sample B, v = 65 cm³
The mass of the sample B, m = 1.3 g
To find the whether there is a chemical reaction has occurred, first to examine the physical properties of the samples.
The color of the samples remains the same. This will not lead to valid result. The scientist need to examine further.
Next level is to check the densities of the substance.
The density of the Sample A
ρₐ = 0.5/45
= 0.011 g/cm³
The density of sample B
ρₓ = 1.3/65
= 0.02 g/cm³
On analyzing the densities of the samples, sample A is less denser than sample B.
Hence, a chemical reaction has occurred.
The aqueous solution will most likely be a base.
