centripetal acceleration of the car=a= 1.46 m/s²
Explanation:
The velocity of an object moving around a circular path is given by
T= time=280 s
r= radius of circular track=2.9 km= 2900 m
V=65 m/s
The centripetal acceleration is given by
a= 1.46 m/s²
1) The buoyant force acting on an object immersed in a fluid is:
where
is the density of the fluid,
is the volume of displaced fluid, and
is the gravitational acceleration.
2) We must calculate the volume of displaced fluid. Since the titanium object is completely immersed in the fluid (air), this volume corresponds to the volume of 1 Kg of titanium, whose density is
. Using the relationship between density, volume and mass, we find
3) Now we can recall the formula written at step 1) and calculate the buoyant force. The air density is
, so we have
4) The weight of 1 Kg of titanium is instead:
So, the buoyant force is negligible compared to the weight.
Hello!
On a cold winters day, if you left a drink setting outside, it could freeze because the heat (related to the kinetic energy) of the atoms in the drink will be transferred to the environment to achieve energy equilibrium.
Heat transfer occurs by various mechanisms, flowing from the hottest body to the coldest, that's why the heat goes from the drink, which has a higher temperature (and kinetic energy) to the environment, which has a lower temperature. This is described by the second law of thermodynamics
Yes it does ! Uh huh. Right you are. Truer words are seldom written.
You have quoted the law quite accurately but also incompletely.
Do you have a question to ask ?
Answer:
The statement which is true:
- The potential difference across the capacitor decreases.
Explanation:
- As given that the capacitor is isolated that means that the charge on the plates of the capacitor remains the same.
- When the dielectric as mica is inserted then the capacitance increases.
- As well as the potential difference across the capacitor decreases which can be understood by the following equation:
V = Q / C
where V show potential difference across the capacitor, Q is the charge and C is the capacitance.
- As the capacitance increases the potential difference decreases and when the capacitance decreases the potential difference increases.