A van is traveling on a road at a speed of 55 km/h. A girl sitting near the driver of the van throws a paper airplane to a boy a
2 answers:
Answer:
53 km/h
Explanation:
Let's take as positive direction the direction in which the van is moving. In this case, we can write as follows:
- Velocity of the van relative to the road:
- Velocity of the paper airplane relative to the van: (with a negative sign since it is moving into opposite direction)
Therefore, the velocity of the paper airplane relative to the road (stationary observer) will be
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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.
