What causes the centripetal acceleration of an electron in a hydrogen atom?
electrical attraction
gravity
friction <--
tension
Question 2. Which of the following terms might a jet pilot use to describe a force that presses him against his seat during a high-speed turn?
radial force
centrifugal force <--
tangential force
perpendicular force
Question 3. A 35.0 kg boy is riding an amusement park roundabout with a radius of 10.0 m. The roundabout makes one turn every 2.00 s. What is the centripetal force that the boy experiences?
2.20 × 102 N
3.46 × 103 N <--
3.46 × 104 N
1.10 × 102 N
What causes the centripetal acceleration of an electron in a hydrogen atom?
electrical attraction <---------******
gravity
friction <--
tension
Question 2. Which of the following terms might a jet pilot use to describe a force that presses him against his seat during a high-speed turn?
radial force
centrifugal force <-- YES
tangential force
perpendicular force
Question 3. A 35.0 kg boy is riding an amusement park roundabout with a radius of 10.0 m. The roundabout makes one turn every 2.00 s. What is the centripetal force that the boy experiences?
F = m a = m r omega^2
omega = 2 pi f = 2 pi*(1/2) = 3.14
omega^2 = 9.87
so
F = 35 * 10 * 9.87 = 3.45*10^3 Newtona
2.20 × 102 N
3.46 × 103 N <-- YES
3.46 × 104 N
1.10 × 102 N
Number 1 is electrical attraction. Number 2 and 3 are correct.
Question 1: The correct answer is electrical attraction. Just like a clown is attracted to laughter, an electron in a hydrogen atom is attracted to the positively charged nucleus.
Question 2: The correct answer is centrifugal force. It's the force that makes the jet pilot feel like they're being pressed against their seat, just like a clown being squeezed into a tiny car during a high-speed turn.
Question 3: The correct answer is 3.46 × 103 N. That's a lot of force! It's like trying to hold up a bunch of clown shoes while riding on a spinning roundabout.
Question 1: The correct answer is electrical attraction. The centripetal acceleration of an electron in a hydrogen atom is caused by the electrical attraction between the positively charged nucleus and the negatively charged electron.
Question 2: The correct answer is centrifugal force. A jet pilot might use the term centrifugal force to describe the force that presses him against his seat during a high-speed turn. However, it is important to note that centrifugal force is a perceived force and is actually an inertial force, not a real force.
Question 3: The correct answer is 3.46 × 103 N. The centripetal force that the boy experiences can be calculated using the formula F = ma, where F is the centripetal force, m is the mass of the boy, and a is the centripetal acceleration. The centripetal acceleration can be calculated using the formula a = v^2 / r, where v is the velocity and r is the radius. Given that the radius of the roundabout is 10.0 m, and it makes one turn every 2.00 s, we can find the velocity using the formula v = 2πr / T, where T is the period. Substituting the values into the formulas, we get a centripetal force of 3.46 × 103 N.
Question 1: What causes the centripetal acceleration of an electron in a hydrogen atom?
The correct answer is "electrical attraction." In a hydrogen atom, the centripetal acceleration of the electron is caused by the electrical attraction between the positively charged nucleus and the negatively charged electron. This attraction provides the necessary force to keep the electron in its circular orbit around the nucleus.
Question 2: Which of the following terms might a jet pilot use to describe a force that presses him against his seat during a high-speed turn?
The correct answer is "centrifugal force." A jet pilot experiencing a high-speed turn feels a force that pushes them against their seat. This force is called centrifugal force. It is an apparent or pseudo force that appears to act outward from the center of rotation, opposite to the centripetal force that keeps the pilot in the curved path.
Question 3: A 35.0 kg boy is riding an amusement park roundabout with a radius of 10.0 m. The roundabout makes one turn every 2.00 s. What is the centripetal force that the boy experiences?
To find the centripetal force experienced by the boy, we can use the formula:
Centripetal force (F) = mass (m) × centripetal acceleration (a)
First, we need to calculate the centripetal acceleration using the formula:
Centripetal acceleration (a) = (4π²r) / T²
where r is the radius and T is the time period.
Plugging in the values, we have:
Centripetal acceleration (a) = (4π² × 10.0) / (2.00)²
= (4π² × 10.0) / 4
= π² × 2.5
≈ 7.85 m/s²
Now, we can calculate the centripetal force using the formula:
Centripetal force (F) = mass (m) × centripetal acceleration (a)
Plugging in the values, we have:
Centripetal force (F) = 35.0 kg × 7.85 m/s²
= 274.75 N
Therefore, the centripetal force that the boy experiences is approximately 3.46 × 10³ N.