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A 3-kg object moving to the right on a frictionless, horizontal surface with a speed of 2 m/s collides head-on and sticks to a 2-kg object that is initially moving to the left with a speed of 4 m/s. After the collision, which statement is true?
The kinetic energy of the system is 20 J.
The momentum of the system is?
The momentum of the system is 14 kg·m/s.
The kinetic energy of the system is greater than 5 J but less than 20 J.
The momentum of the system is less than the momentum of the system before the collision.
A very long solenoid of circular cross section with radius r= 5.4cm has n= 86.0 turns/cm of wire. An electron is sitting outside the solenoid, at a distance r= 5.90 cm from the solenoid axis. What is the magnitude of the force on the electron whil..
Calculate the force of gravity on the same 1-kg mass if it were is 6.4 x106 m above the earth’s surface (that is, if it were 2 Earth radii from the Earth’s center)
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A refracting telescope has an angular magnification of -92.00. The length of the barrel is 1.100 m. What are the focal lengths of the objective
Describe briefly a current health problem. A father racing his son has half the kinetic energy of the son, who has one-third the mass of the father. The father speeds up by 2.5 m/s and then has the same kinetic energy as the son.
a research submarine has a 40cm diameter window that is 8.2cm thick. the manufacturer says the window can withstand
On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a golf club improvised from a tool. How much farther would it have traveled on the moon than on earth
An object with a charge of -3.8 µC and a mass of 0.046 kg experiences an upward electric force, due to a uniform electric field, equal in magnitude to its weight. find the direction and magnitude of its acceleration
The temperature of the glass surface of a 30 W light bulb is 75°C when the room temperature is 10°C. Estimate the temperature of a 150 W light bulb with a glass bulb the same size. Consider only radiation, and assume that 90% of energy is emitted as ..
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