Speed, Acceleration and Centripetal Acceleration

An object is travelling at a constant speed of 10m/s around a circular path. The radius of the circle is 5m. What is its centripetal acceleration?

• 20 m/s^2

• 12 m/s^2

• 45 m/s^2

• 18 m/s^2

Tags

NGSS.HS-PS2-1

When a truck moves around in a circle with constant radius and speed, what is true?

• Acceleration is towards the centre
• Acceleration is zero
• Velocity is constant
• Acceleration is constant

Two balls are being swung on two strings of different length and they have different linear velocities. Ball A has a string of length r and a linear velocity of 3v. Ball B has a string of length 4r and a linear velocity of v. If T is the time period of ball A, what is the time period of ball B in terms of T?

• 4/3 T
• 3/4 T
• 12 T
• 1/12 T

What is centripetal force?

• A body that make a force follow a straight path
• A force that makes a body follow a straight path
• A force that makes a body follow a curved path
• A body that make a force follow a curved path

What is the resistance of an ideal voltmeter and ammeter. (Ohms)

• Voltmeter: Infinity, Ammeter: 0

• Voltmeter: Infinity, Ammeter: Infinity

• Voltmeter: 0, Ammeter: Infinity

• Voltmeter: 0, Ammeter: 0

Two balls are being spun on a string, both having the time period of 4 seconds. Ball A has the string length of 1m and ball B has the string length of 4m. What is the difference in their linear velocity in m/s?

• 0.5π m/s
• 2π m/s
• 3π/2 m/s
• 2.5π m/s

A tire with a diameter of 70cm spins with an angular velocity of 19 rad/sec. The linear velocity of a point on the circumference is around:

• 6 m/s
• 4 m/s
• 13 m/s
• 7 m/s

An object is experiencing uniform circular motion, choose the WRONG statement regarding its motion.

• Its acceleration vector and velocity vector are always perpendicular to each other.
• Its velocity vector is constant.
• Its acceleration vector is always towards the center of the circle.
• Its velocity vector is tangent to the circle.

Where do objects moving in circles at a constant speed accelerate towards?

• Tangent to the circle
• Away from the center of the circle
• It does not accelerate
• The center of the circle

What does RPM stand for?

• Radians per minute
• vRooms Per minute
• Revolutions per minute
• Revolutions per meter