PHY101 Midterm Past Paper 2

PHY101 Mid Term

A 4.0-N puck is traveling at 3.0m/s. It strikes a 8.0-N puck, which is stationary. The two pucks stick together. Their common final speed is:

1. 1.0m/s
2. 1.5m/s
3. 2.0m/s
4. 2.3m/s

Correct answer: 1.0m/s

An object moving in a circle at constant speed:

1. must have only one force acting on it
2. is not accelerating
3. is held to its path by centrifugal force
4. has an acceleration of constant magnitude

Correct answer: has an acceleration of constant magnitude

A plane traveling north at 200m/s turns and then travels south at 200m/s. The change in its velocity is:

1. 400m/s north
2. 400m/s south
3. zero
4. 200m/s south

Correct answer: 400m/s south

At time t = 0 a car has a velocity of 16 m/s. It slows down with an acceleration given by −0.50t, in m/s2 for t in seconds. It stops at t =

1. 64 s
2. 32 s
3. 16 s

PHY101 Mid Term

1. 8.0 s

Q1. mi is equivalent to 1609 m so 55 mph is:

1. 15 m/s
2. 25 m/s
3. 66 m/s
4. 88 m/s

Correct answer: 25 m/s

The number of significant figures in 0.00150 is:

1. 5
2. 4
3. 3
4. 2

One revolution is the same as:

1. 1 rad
2. 57 rad
3. π/2 rad
4. π rad
5. 2π rad

For a body to be in equilibrium under the combined action of several forces:

1. All the forces must be applied at the same point
2. all of the forces form pairs of equal and opposite forces
3. any two of these forces must be balanced by a third force
4. the sum of the torques about any point must equal zero

PHY101 Mid Term

A bucket of water is pushed from left to right with increasing speed across a horizontal surface. Consider the pressure at two points at the same level in the water.

1. It is the same
2. It is higher at the point on the left
3. It is higher at the point on the right
4. At first it is higher at the point on the left but as the bucket speeds up it is lower there

An organ pipe with both ends open is 0.85m long. Assuming that the speed of sound is 340m/s, the frequency of the third harmonic of this pipe is:

1. A. 200 Hz
2. B. 300 Hz
3. C. 400 Hz
4. D. 600 Hz

Correct answer: D. 600 Hz

Capacitors C1 and C2 are connected in series. The equivalent capacitance is given by

1. C1C2/(C1 + C2)
2. (C1 + C2)/C1C2
3. 1/(C1 + C2)
4. C1/C2

If the potential difference across a resistor is doubled:

1. only the current is doubled