Exam 2: Describing Motion: Kinematics in One Dimension

A toy rocket is launched vertically from ground level at time t = 0.00 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket Has risen to 64 m and acquired an upward velocity of 60 m/s. The rocket continues to rise with Insignificant air resistance in unpowered flight, reaches maximum height, and falls back to the Ground. The time interval during which the rocket engine provided the upward acceleration, is Closest to

The slope of a velocity versus time graph gives

Sonar is used to determine the speed of an object. A 40.0-kHz signal is sent out, and a 42.0-kHz signal is returned. If the speed of sound is 345 m/s, how fast is the object moving?

A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What was the average speed of the runner in m/s?

In a resonating pipe that is open at one end and closed at the other end, there

The nichrome heating element in an electric drier operates on 240 V and generates heat at the rate of 2.0 kW. The heating element shorts out and, in repairing it, the repairman shortens the Nichrome wire by 10%. (Assume the temperature is unchanged. In reality, the resistivity of the Wire will depend on its temperature.) What effect will the repair have on the power dissipated in The heating element?

An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the trip?

An object starts from rest and undergoes uniform acceleration. During the first second it travels 5.0 m. How far will it travel during the third second?

To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the height of the bridge is 41 m, how long will it take for the Stone to hit the water? Neglect air resistance.

The motions of a car and a truck along a straight road are represented by the velocity-time graphs in the figure. The two vehicles are initially alongside each other at time t = 0. At time T, what is true of the distances traveled by the vehicles since time t = 0?

Human reaction time is usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it, Assuming negligible air resistance?

An ideal Carnot engine is operated as a heat pump to heat a room in the winter. The heat pump delivers heat to the room at the rate of 47 kJ per second and maintains the room at a temperature Of 293 K when the outside temperature is 237 K. The power requirement to run the heat pump Under these operating conditions is closest to

What characteristics of a sound wave are related to the "pitch" of a musical note? (There could be more than one correct choice.)

Convert 1.2 × 10-3 to decimal notation.

An auto accelerates forward from 7.0 m/s at a uniform It travels a distance of 1.033 km while accelerating. (a) How fast is the auto moving just as it is traveled the 1.033 km ? (b) How many seconds did it take to travel the 1.033 km?

If the absolute temperature of an object is tripled, the thermal power radiated by this object (assuming that its emissivity and size are not affected by the temperature change) will

Grandfather clocks are designed so they can be adjusted by moving the weight at the bottom of the pendulum up or down. Suppose you have a grandfather clock at home that runs slow. Which Of the following adjustments of the weight would make it more accurate? (There could be more Than one correct choice.)

An capacitor consists of two large parallel plates of area A separated by a very small distance d. This capacitor is connected to a battery and charged until its plates carry charges +Q and -Q, and Then disconnected from the battery. If the separation between the plates is now doubled, the Potential difference between the plates will

Two in-phase loudspeakers are some distance apart. They emit sound with a frequency of 536 Hz. A microphone is moved between the speakers along the line joining the two speakers with a Constant speed of 1.60 m/s. What beat frequency is observed? The speed of sound in air is 343 m/s.

The electron-volt is a unit of