8. A baseball is hit upward and travels along a parabolic arc before it strikes the se
1 answer:
d. The x-component of the velocity of the ball is the same througout the ball's flight
Explanation:
The motion of the baseball is a projectile motion, which consists of two independent motions:
- A uniform motion (constant velocity) along the horizontal direction
- A uniformly accelerated motion, with constant acceleration (acceleration of gravity) in the downward direction.
From this description, we can already see that the correct statement is D: in fact, there is no force acting in the horizontal direction on the ball (if we neglect air resistance), therefore the acceleration in the x-direction is zero, therefore the x-component of the velocity is constant.
The other statements are wrong because:
a. The acceleration of the ball decreases as the ball moves upward. --> false because the acceleration remains the same ( downward)
b. The velocity of the ball is zero m/s when the ball is at the highest point in the arc. --> false because only the y-component of the ball's velocity is zero at the highest point, but the x-component is not zero
c. The acceleration of the ball is zero m/s when the ball is at the highest point in the arc. --> false because the acceleration remains the same ( downward)
Therefore the correct answer is
d. The x-component of the velocity of the ball is the same througout the ball's flight
Learn more about projectile motion:
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Answer:
F = 0.078N
Explanation:
In order to calculate the magnitude of the force on the wire you first calculate the magnitude of the magnetic field generated by the solenoid, by using the following formula:
(1)
μo: magnetic permeability of vacuum = 4π*10^-7 T/A
N: turns of the solenoid = 580
i: current in the solenoid = 36A
L: length of the solenoid = 18cm = 0.18m
You replace the values of all parameters in the equation (1):
Next, you calculate the force exerted on the wire, by using the following formula:
(2)
i: current in the wire = 27A
L: length of the wire that perceives the magnetic field (the same as the radius of the solenoid) = 2.0 cm = 0.02m
θ: angle between wire and the direction of B
B: magneitc field in the solenoid = 0.145T
The direction of the wire are perpendicular to the direction of the magnetic field, hence, the angle is 90°.
You replace the values of the parameters in the equation (2):
The magnitude of the force on the wire is 0.078N