A police officer is chasing a purse-snatcher down a street. The thief
1 answer:
Answer:
3 seconds
Explanation:
We can give an expression for the position of both the thief and of the police officer at time t.
The position of the thief at time t is given by
where 9 is its initial position in m and 5 is its speed in m/s.
Instead, the position of the police officer at time t is given by
where 0 is its initial position in m and 8 is its speed in m/s.
The police officer will catch the thief when their position will be equal, so
By solving,
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Answer:
16.8 lb is the force on the brake pad of one wheel.
Explanation:
Force applied on the piston =
Area of the piston =
Force applied on the brakes =
Area of the brakes =
Applying Pascal's law: 'For an incompressible fluid pressure at one surface is equal to the pressure at other surface'.
16.8 lb is the force on the brake pad of one wheel.
Answer:
+16 J
Explanation:
We can solve the problem by using the 1st law of thermodynamics:
where
is the change of the internal energy of the system
Q is the heat (positive if supplied to the system, negative if dissipated by the system)
W is the work done (positive if done by the system, negative if done by the surroundings on the system)
In this case we have:
Q = -12 J is the heat dissipated by the system
W = -28 J is the work done ON the system
Substituting into the equation, we find the change in internal energy of the system:
Answer:
Cell surface.
- Cilium
- Plasma membrane
- Microvilus.
Nucleus
- Cellular DNA
- Nucleolus
- Chromosome.
Cytoplasm
- Mitochondria
- Golgi apparatus
- Cytoskeleton.
