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You are sitting in a wagon and rolling horizontally at 5 m/s when your little sister jumps into your lap as you pass by. Your mass is 50 kg, your sister's mass is 20 kg, and that of the wagon is 3 kg.
a) Does this situation represent an elastic or an inelastic collision? Explain your reasoning.
b) What physical quantities are conserved in this kind of collision?
c) Calculate the speed of the wagon after your little sister jumps in.
A runner wearing spiked shoes pulls a 18 kg sled across frictionless ice using a horizontal spring with spring constant 170 N/m. What is the acceleration of the sled
A 440-turn solenoid is 30 cm long and 1.1 cm in diameter and carries 57 mA. How much magnetic energy does it contain
A piece of lead [c = 128 J/(kg·C°)] is heated from 18.0° C to 31.0° C. The same amount of heat is added to a piece of copper [c = 387 J/(kg·C°)]. Determine the final temperature Tf of the copper
A small piece of dust of mass m = 1.50g travels horizontally through an electric air cleaner in which the electric field is 498N/C. The electric force on the particle is equal to weight of the particle.
Consider a spider walking from the top of a (stationary) beach ball. (Let that angular position = 0O.), At what angle does this slipping begin
A guitar string is tuned to an E4, The concert pitch standard A440 has a frequency of 440 Hz. What is the wavelength of this pitch in air
Briefly describe: (a) Charging by friction (b) Charging by contact (c) Charging by induction *In one sentence if possible.
A 20 liter tank of helium is at a pressure of 190 kPa at a temperature of 0 C. What is the speed of the helium atoms in the tank at this new volume
Consider a fusion reaction in which a proton fuses with a neutron to form a deuterium nucleus. How much energy is released in this reaction
a 1cm-tall object is 6cm in front of a converging lens with a focal length of 10cm. Use ray tracting to determine the location of the image on graph, Calculate the image position and height using the lens equation
The sun is more massive than the moon, but the sun is farther from the earth. Which one exerts a greater gravitational force on a person standing on earth? Give the answer by determining the ratio Fsun/ Fmoon of magnitudes of gravitational forces.
A jogger accelerates from rest to 2.40 m/s in 3.44 s. A car accelerates from 18.8 to 36.5 m/s also in 3.44 s. Find the magnitude of the acceleration of the jogger
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