Select all that apply. An acorn falls from a tree. Which of the following statements is true? The force of gravity is acting on
the acorn. The force of gravity is the only force acting on the acorn. A frictional drag force is acting on the acorn. The net force on the acorn is less than the force of gravity.
2 answers:
Answer:
The force of gravity is acting on the acorn.
A frictional drag force is acting on the acorn.
The net force on the acorn is less than the force of gravity.
Explanation:
The force of gravity is acting on the acorn is in vertically downwards direction.
A frictional drag force is acting on the acorn is in vertically upwards direction.
The net force on the acorn is given by
Net force = Force of gravity - Frictional drag force
It is always less than the force of gravity.
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Answer:
3.28 cm
Explanation:
To solve this problem, you need to know that a magnetic field B perpendicular to the movement of a proton that moves at a velocity v will cause a Force F experimented by the particle that is orthogonal to both the velocity and the magnetic Field. When a particle experiments a Force orthogonal to its velocity, the path it will follow will be circular. The radius of said circle can be calculated using the expression:
r =
Where m is the mass of the particle, v is its velocity, q is its charge and B is the magnitude of the magnetic field.
The mass and charge of a proton are:
m = 1.67 * 10^-27 kg
q = 1.6 * 10^-19 C
So, we get that the radius r will be:
r = = 0.0328 m, or 3.28 cm.
