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Physics
Physics
High School
a cheetah running at a velocity of 18 m/s accelerates 1 m/s2 for 5 sec. what is the final velocity of the cheetah?
Physics
High School
a flight attendant pushes a cart down the aisle of a plane in flight. in determining the acceleration of the cart relative to the plane, which factor do you not need to consider?
Physics
High School
Camille knows that range of motion is very important. She is designing a weekly exercise program and is not sure where flexibility fits in. Whattype of exercise will BEST allow her to work on range of motion?O A.aerobicB. balanceC. flexibilityD. strength training
Physics
High School
to save money on making military aircraftinvisible to radar, an inventor decides to coatthem with a nonreflective material having anindex of refraction of 1.20, which is betweenthat of air and the surface of the plane. this, hereasons, should be much cheaper thandesigning stealth bombers. (a) what thicknessshould the coating be to inhibit the reflection of4.00-cm wavelength radar? (b) what isunreasonable about this result? (c) whichassumptions are unreasonable or inconsistent?
Physics
High School
Where are most near infrared telescopes located Why?
Physics
High School
2. a concave lens made out of air is immersed in water (two watch glasses glued to a piece of pipe so that air is inside). will it form a real image that can be focused on a screen? why or why not? justify your answer using a refraction ray diagram.
Physics
High School
If two trucks have the same mass, but truck a is traveling 15 km/h, and truck b is traveling 30 km/h, what statement is true?.
Physics
High School
Assume you are driving 20 mph on a straight road. Also, assume that at a speed of 20 miles per hour, it takes 100 feet to stop. If you were to increase your speed to 40 miles per hour, your stopping distance is now [distance].
Physics
High School
gravitational field of the earth is 11.2 km s the ratio of the escape velocity to the root-mean-square speed of helium, argon, and xenon atoms at 2000 k. does your result help explain the low abundance of the light gas helium in the atmosphere? explain.
Physics
High School
in a certain cyclotron a proton moves in a circle of radius 0.500 m. the magnitude of the magnetic field is 1.20 t. (a) what is the oscillator frequency? (b) what is the kinetic energy of the proton, in electron-volts?
Physics
High School
A particular species of copepod, a small marine crustacean, emits a flash of light consisting of 1.41010 photons at a wavelength of 490 nm. The flash lasts for 2.4 s.What is the power of the flash?
Physics
High School
A star is born whenA . it first starts to fuse hydrogen into helium.B. it first starts to fuse helium into hydrogen.C. it gets its first planet.D. when it goes supernova.
Physics
High School
What is the image of E for a dilation with center 0 0 and a scale factor of 6?
Physics
High School
what is mass wasting? what are some of the important variables used to identify and distinguish types of mass wasting (4 points)?
Physics
High School
a bicyclist starts down a hill with an initial speed of 3.5 m/s. she moves down the hill with a constant acceleration, arriving at the bottom of the hill with a speed of 8.6 m/s. if the hill is 12 m long, what was its acceleration traveling down the hill?
Physics
High School
an electromagnetic wave of wavelength 435nm is traveling in vacuum in the z-direction. the electric field has amplitude 2.70103v/m and is parallel to the x-axis.
Physics
High School
Coherent light with wavelength 400 nm passes through two very narrow slits that are separated by 0.200 mm, and the interference pattern is observed on a screen 4.00 m from the slits. (a) What is the width (in mm) of the central interference maximum? (b) What is the width of the first-order bright fringe?
Physics
High School
What is the internal energy of a system including the kinetic and potential energy of its particles?
Physics
High School
why did the big bang not produce a significant proportion of elements heavier than helium?
Physics
High School
Brandon is on one side of a river that is 80 m wide and wants to reach a point 250 m downstream on the opposite side as quickly as possible by swimming diagonally across the river and then running the rest of the way. Find the minimum amount of time if brandon can swim at 2 m/s and run at 4 m/s.
Physics
High School
A gas is enclosed in a cylinder fitted with a light frictionless piston and maintained at atmospheric pressure. When254kcalof heat is added to the gas, the volume is observed to increase slowly from12.0m^3to16.2m^3.a. Calculate the work done by the gas.b. Calculate the change in internal energy of the gas.
Physics
High School
In a binary-star system that produces a nova, the white dwarf pulls matter from the companion star. the matter forms an accretion disk that orbits the white dwarf. then a specific sequence of events must take place for a nova event to occur.1. Material accumulates onto the white dwarf's surface, increasing in temperature and density. 2. At a temperature of 10 million K, the accumulated surface hydrogen begins nuclear fusion. 3. Nuclear fusion reactions cause an enormous but temporary increase in luminosity. 4. As nuclear fuel is burned up or blown into space, fusion ceases and the star dims.
Physics
High School
What is the kinetic energy of a 1400 kg sports car Travelling down the road with a speed of 30 m s?
Physics
High School
a magnetic field near the ceiling points down and is increasing. looking up at the ceiling, does the non-coulomb electric field curl clockwise or counter-clockwise?
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