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SOS PHYSICS FINAL EXAM 2024/
The prefix giga represents? - Answer✔✔1,000,000, 6.94 x 10^3 mm- 4.5 x 10^2 mm - Answer✔✔6.5 x 10^3 mm 3.981 g + 5.05 g - Answer✔✔9.03 g 9.7 x 10^7 km NE - Answer✔✔Vector 3,250,000s - Answer✔✔37.6 days A football player receives a kick at the opponent's 30-yard line. He scrambles back and forth, left and right, but ends at the same spot he caught the ball. The player, therefore, ( did not, did) move a certain distance. - Answer✔✔Did What is the average speed ( in km/h) of Zhana, who runs to the store that is 4.0 km away in 30.0 minutes? - Answer✔✔8.0 km/h If a skier skis down the hill at 70.0 km/h for 20.0s, and then skis up a slope at 15.0 km/h for 10.0s what is the skier's average velocity? - Answer✔✔41.6 km/h downhill
How long does a car with an acceleration of 2 m/s^2 take to go from 15 m/s to 35 m/s? - Answer✔✔10s Can an object move in a circular path without being accelerated? - Answer✔✔No The radius of the path of an object in uniform circular motion is halved. The centripetal acceleration needed, given that its speed remains the same, is? - Answer✔✔Twice as great as before A runner is moving at a constant speed of 8.00 m/s around a circular track. If the distance from the runner to the center of the track is 28. m,what is the centripetal acceleration of the runner? - Answer✔✔2. m/s^ If a wheel falls from an airplane that is flying horizontally at an altitude of 500 m, how long will it take for the wheel to strike the ground? - Answer✔✔10s A ball is thrown vertically upward. What is the acceleration right before it hits the earth? - Answer✔✔It remains constant. A 430 g football is lying on the ground, then is kicked and is moving at 25 m/s. If the duration of the impact was 0.0010 s, what was the average force on the ball? - Answer✔✔1.1 x 10^4 N
A plant box falls from the windowsill 25.0 m above the sidewalk and hits the cement 3.0 s later. What's in the box's velocity when it hits the ground? - Answer✔✔22 m/s A truck has a mass of 1.5 x 10^4. If the truck can reach a maximum acceleration of 1.5 m/s^2, what is the net force the truck exerts. - Answer✔✔2.3 x 10^4 N A shopper is in the supermarket and pushes a cart with a force of 35.0 N for 75.0 m before reaching the end of the aisle. What work did the shopper do? - Answer✔✔2630 J A 25.5 kg child swings on a set. At the top of the swing's arc, the child reaches a height of 1.50 m from the ground. What are the child's PE and KE at the top of the arc? - Answer✔✔375 J and 0 J A 5.00 kg pendulum swings back and forth. At the top of its arc, it reaches a height of 0.36 m. What is the velocity of the pendulum at the bottom of the arc? - Answer✔✔2.7 m/s What is the kinetic energy of an 8.0 x 10^4 kg airplane flying at 600. km/h? - Answer✔✔1.1 x 10^9 J A 50.0 kg mountain climber climbs 5.00 m up a rope. If the mountains climber's power output is 200.0 W, how long does it take the climber to climb the rope? - Answer✔✔12.3 s
A screwdriver is a lever with an input arm of 15 cm and an output arm of 2.5 cm.If the input arm is the effort distance and the output arm is the resistance distance, what is the IMA of the screwdriver? - Answer✔✔ 6 A screwdriver is a lever with an input arm of 15 cm and an output arm of 2.5 cm. If it takes 50 N of force to open a can of paint the lid of which provides a resistance force of 250 N, what is the AMA of the screwdriver? - Answer✔✔ 5 A screwdriver is a lever with an input arm of 15 cm and an output arm of 2.5 cm. If it takes 50 N of force to open a can of paint the lid of which provides a resistance force of 250 N, what is the efficiency of the screwdriver? - Answer✔✔83% A 15.6 g sample of ethyl alcohol absorbs 0.207 kcal of energy as it is heated. If the initial temperature of the ethanol was 21.5 C, what is the final temperature of the ethanol? - Answer✔✔44.4 C A sample of ethyl alcohol and a sample of aluminum have the same mass. Which sample absorbs more energy as it is heated from 25 C to 56 C? - Answer✔✔Ethyl Alcohol Calculate the energy needed to change 200.0 g of ice from -20.0 C to water at 35 C. - Answer✔✔24.94 kcal Calculate the energy needed to change 200.0 g of water from 50.0 C to steam at 110.0 C. - Answer✔✔119.0 kcal
A truck crossing a bridge causes the bridge to vibrate. The bridge ceases to vibrate after the truck crosses. This is an example of. - Answer✔✔Forced Vibrations Two tuning forks, 492 Hz and 498 Hz, are struck simultaneously. How many beats will be heard. - Answer✔✔6.00 Beats What is the speed of sound in air at 38.0 C? - Answer✔✔354 m/s An echo is heard 5.00 s from the initial sound and the air temperature is 25.0 C. How far away is the barrier that reflected the sound? - Answer✔✔865 m As light shines from air to another medium.the light bends toward the normal and refracts at 38.0. What is the index of refraction? - Answer✔✔1. As light shines from air to water, the index of refraction is 1.02 and the angle of incidence is 38.0 what is the light's angle of refraction? - Answer✔✔37. If a light ray enters one medium from another along that normal, what is the angle of refraction? - Answer✔✔ 0
When a light wave approaches a glass-air interface from the glass side at the critical angle, the angle of refraction is. - Answer✔✔ 43 If the color orange has a frequency of 5.0 x 10^14 Hz, what is its wavelength? - Answer✔✔6.0 x 10^-7 m The image formed by a plane mirror is - Answer✔✔Upright and reversed A - is used to make magnifying glasses - Answer✔✔Convex Lens A - is used in car headlights - Answer✔✔Concave Mirror If a concave mirror has a focal length of 10.0 cm, what is the image distance of a pen that is placed upright 5.00 cm from the mirror? - Answer✔✔-10.0 cm Discovered that light also showed properties commonly found in waves.
- Answer✔✔Thomas Young An object that is farther from a converging lens than its focal point always has an image that is - Answer✔✔Inverted If the distance of a real object from a converging lens equals the focal length of the lens, the image is - Answer✔✔Not Formed
Determine the potential difference between two charged parallel plates that are 0.50 cm apart and have an electric field strength of 9.0 V/cm. - Answer✔✔4.5 V If we remove 10,000 electrons from a neutral plastic wand, the wand's charge is now - Answer✔✔+1.6 x 10^-15 C If the potential across two parallel plates, separated by 4.0 cm, is 15.0 V, what is the electric field strength in volts per meter? - Answer✔✔380 V A charged capacitor has an energy content that resides in the - Answer✔✔Electric Field A 60-uf capacitor has a potential difference of 15 V across it. Its charge is - Answer✔✔900 C Calculate conductance of a conduit the cross- sectional area of which is 1.5 cm^2 and the length of which is 9.5 c, given that it's conductivity is 0.65 ohm -1 cm-1 - Answer✔✔0.10 ohm^- Find the conductivity of a conduit with a cross sectional area of 0. cm^2 and a length of 15.0 cm, given that its conductance G is 0. ohm-1 - Answer✔✔10.0 ohm^-
Of the following, which combination of length and cross- sectional area would give a volume of copper the least resistance. - Answer✔✔1/2 L and 2A Compute the resistance in ohms of silver block 10.0 cm long and 0. cm^2 in cross-sectional area. - Answer✔✔6.5 x 10^-5 ohms Calculate the current in a 48 resistor when a potential difference of 330 V is placed across it. - Answer✔✔6.9 amps Which wire has the greatest resistance? - Answer✔✔The last one If a 50 W light bulb and a 90 W light bulb operate from 120 V, which bulb has a greater current in it? - Answer✔✔90 W If a nichrome wire has a resistance of 15 and is connected across the terminals of a 3.0 V flashlight battery, how much current is in the wire?
- Answer✔✔0.20 amps A 15.0 volt storage battery is connected to three resistors, 7.75, 15.5, 21.7 respectively. The resistors are joined in series. What is the current in the circuit? - Answer✔✔0.333 amps A 9.0 resistor is connected in series with another resistor and a 6.0 V battery. The current in the circuit is 0.60 amps. calculate the resistance of the unknown resistor. - Answer✔✔1.
Solenoids can be used as powerful magnets called electromagnets if _ is used as the material the current-carrying wire is wrapped around. - Answer✔✔Iron A green light emits light with a wavelength of 5.10 x 10^-7 m. Calculate the frequency of the green light. - Answer✔✔6.00 x 10^14 Hz Use Planck's equation to calculate the energy of a single photon with the given wavelength. - Answer✔✔3.98 x 10^-19 J A 75,000 watt radio station transmits at 88 MHz. Determine the number of joules transmitted per second. - Answer✔✔75,000 J/s Calculate the energy of a single photon at the transmitted frequency. - Answer✔✔5.8 x 10^-26 J/photon Calculate in joules the maximum kinetic energy of a single electron. - Answer✔✔2.91 x 10^-17 J Calculate the energy in electron volts of X-rays that have a frequency of 6.00 x 10^16 Hz. - Answer✔✔249 eV Calculate the de Broglie wavelength of an electron traveling at 5.0 x 10^6 m/s - Answer✔✔1.5 x 10^-10 m
Which of the following results was evidence that the proton was part of an atoms nucleus? - Answer✔✔The alpha particles shot at the gold foil straight back off the foil and struck the front side of the film. The last main subatomic particle to be discovered was the - Answer✔✔Neutron Copper with Z=29 has how many electrons in n=3? - Answer✔✔ 18 If an element has an atomic mass of 209 and a atomic number of 83, how many neutrons does it have? - Answer✔✔ 126 Supposing element S has a half life of 25 years, if you have a 100 gram sample of S, how much would be left after 50 years? - Answer✔✔25 g Is the following nuclear equation balanced? - Answer✔✔No An ongoing series of fission reactions is called a - Answer✔✔Chain Reaction Which of the following is a major problem of nuclear fusion? - Answer✔✔Maintaining high temperatures A cycler leaves home and rides due south for 65 k. She returns home on the same road. What is the cycler's displacement? - Answer✔✔0 km
