Answer:
b
Explanation:
he keep the thermoter in the water longer
Answer:
d. from the equilibrium position to the bottom and then back to the equilibrium.
g. from the top position to the bottom and then back to the top.
h. from the bottom position to the top and then back to the bottom.
Explanation:
It is the case of SHM or Simple Harmonic Motion. Firstly, there is a need to understand the time interval or time period. The standard definition of time period in simple harmonic motion is
"the time period required for the system to complete its one cycle"
Now one have to consider that the system given above, the motion of mass attached to spring will follow the path of motion from equilibrium point to bottom to equilibrium point to top, then equilibrium point to the bottom and so on.
to choose right answer you must have to consider the option, in which the starting point and ending point of the mass is same. If mass starts from top, the time it will take to reach on top again, will be defined as its time period and so in the case of bottom or equilibrium as starting point. Hence, "d", "g" and "h" are right answers.
Answer:
9.5 km/h
Explanation:
Let v₁ and v₂ be the rates of the cars.
Given that v₂ = v₁ - 20
The first car travels a distance v₁t in t = 5 hrs and the second car travels a distance of v₂t in t = 5 hrs. The total distance between them is 850 km.
So v₁t + v₂t = 850
v₁t + (v₁ - 20)t = 850
v₁t + v₁t - 20t = 850
2v₁t - 20t = 850 at t = 5 hrs
2v₁ × 5 - 20 × 5 = 850
10v₁ - 100 = 850
10v₁ = 850 + 100
10v₁ = 950
v₁ = 950/10 = 9.5 km/h
v₂ = v₁ - 20 = 9.5 - 20 = -10.5 m/s
Since magnitude of v₁ < v₂
The rate of the slower car is 9.5 km/h
<h3>Newtons first law state that if a body is in motion it will be in motion and if a body is in rest it will tend to be in rest. This phenomena is also called INERTIA. Example: We tend to fall sideways when a car turn suddenly</h3>