Exam 2: Force and Newtons Laws of Motion, Oscillations, Gravitation, Work and Energy

Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal 100 N pull, as shown in the figure. Both of them are moving together at a constant velocity of 2.0 m/s to the right, and both weigh the same. Which of the figures below shows a correct free-body diagram of the horizontal forces acting on lower block, B?

Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal 100 N pull, as shown in the figure. Both of them are moving together at a constant velocity of 2.0 m/s to the right, and both weigh the same. Which of the figures below shows a correct free-body diagram of the horizontal forces acting on upper block, A?

-In the figure, a certain type of string will break if the tension in the string exceeds 300 N. A number of 8-kg weights are hung one below the other from a hook in the ceiling using this string. The number of weights that causes the string to break and the string segment that will break are as follows:

Consider what happens when you jump up in the air. Which of the following is the most accurate statement?

A leaky faucet drips 40 times in 30.0 s. What is the frequency of the dripping?

At their closest approach, Venus and Earth are 4.20 × 10¹⁰ m apart. The mass of Venus is 4.87 × 10²⁴ kg, the mass of Earth is 5.97 × 10²⁴ kg, and G = 6.67 × 10^-11 N · m²/kg/². What is the force exerted by Venus on Earth at that point?

On its own, a tow truck has a maximum acceleration of 3.0 m/s^-2. What would be the maximum acceleration when the truck was towing a bus of twice its own mass?

A 0.25 kg harmonic oscillator has a total oscillation energy of 4.0 J. If the oscillation amplitude is 20.0 cm, what is the oscillation frequency?

The figure shows an object's acceleration-versus-force graph. What is the object's mass in grams?

An object accelerates at 4.1 m/s² under the action of two rubber bands. What will be the object's acceleration if it is pulled by four rubber bands?

The figure shows two forces acting on an object. They have magnitudes F₁ = 6.3 N and F₂ = 2.1 N. What third force will cause the object to be in equilibrium?

Consider the following figure. Assume the strings and pulleys have negligible masses and the coefficient of kinetic friction between the 2.0 kg block and the table is 0.25. What is the acceleration of the 2.0 kg block?

The speed for a "low" circular orbit about the Earth is about

Two cyclists, who weigh the same and have identical bicycles, ride up the same mountain, both starting at the same time. Joe rides straight up the mountain, and Bob rides up the longer road that has a lower grade. Joe gets to the top before Bob. Which statement is true?

The length of a pendulum changes by thermal expansion. If the length increases by 0.1%, what would be the change in the period?

A dog is standing in the tail bed of a pickup truck. The tail bed is coated with ice, causing the force of friction between the dog and the truck to be zero. The truck is initially at rest, and then accelerates to the right, moving along a flat road. As seen from a stationary observer (watching the truck move to the right), the dog