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Physics
Physics
High School
light from a slit passes through a transmission diffraction grating of 325 lines/mm, which is located 2.6 m from a screen. what are the distances on the screen (from the unscattered slit image) of the three brightest visible (first-order) hydrogen lines? (enter your answers in cm.)
Physics
College
Which of the following statements concerning momentum is true?* A.Momentum is a scalar quantity. B.The momentum of an object is always positive. C.Momentum is a force. D.Momentum is a vector E.The SI unit of momentum is the Newton.
Physics
High School
which graph of v versus t best describes the motion of a particle with positive velocity and negative acceleration?
Physics
High School
should senior citizens perform balance exercises?A. to build muscle tissueB. to reduce chances of fallsC. to build overall enduranceD. to reduce "staying power"Please select the best answer from the choices provided.
Physics
College
Why was it difficult for american ground forces to clear areas of guerrillas in north vietnam? select two answers. The guerrillas hid themselves from american forces. The north vietnamese guerrillas were more capable fighters. The north vietnamese guerrillas had superior weapons. The guerrillas fled while the ground forces were in their area.
Physics
High School
Mr. Hughes' 450 kg race car accelerates from 0 to 88 m/s in 4 seconds.A)How much work does the engine do?B)How much power does it have? C)How much kinetic energy does it have after 4 seconds?Please help
Physics
College
TheThe leader of a bicycle race is traveling with a constant velocity of +11.1 m/s and is 9.60 m ahead of the second-placesecond-place cyclist has a velocity of +9.80 m/s and an acceleration of +1.20 m/s. How much time elapses before he catches theleader?
Physics
High School
How much time will it take a paper airplane to travel 5 m straight at a 2 m/s/s velocity?
Physics
High School
a marble rolls off a tabletop 1.4 m high and hits the floor at a point 2 m away from the table's edge in the horizontal direction. how long is the marble in the air? s what is the speed of the marble when it leaves the table's edge? m/s what is its speed when it hits the floor?'
Physics
High School
ramon has contact lenses with the prescription 2.0 d. a. what eye condition does ramon have? b. what is his near point without the lenses?
Physics
High School
what type of pipe do you have? view available hint(s)for part a what type of pipe do you have? open-open closed-closed open-closed either open-open or closed-closed an air-filled pipe is found to have successive harmonics at 480 hz , 800 hz , and 1120 hz . it is unknown whether harmonics below 480 hz and above 1120 hz exist in the pipe. what is the length of the pipe?
Physics
College
how crumple zones and air bags can reduce the chance of death or injury using the principle of physics
Physics
High School
The average person has a surface area of 1.5-2.0 m. If the person is lying on flat ground, let's assume that about 40% of the person's surface area is in contact with the ground, which would be about 0.6-0.8 m.(a) A student with a mass of 50. kg is lying on the floor of the classroom. The area of the student that is in contact with the floor is 0.6 m. What is the pressure between the student and the floor?(b) Mr. Bigler's bed of nails was built with approximately 3300 nails evenly spread over an area of 1.11 m. The head of each nail has an area of approximately 0.1 mm=1 x 10-7 m. Based on these numbers and the surface area of contact for the studentin part #6a, what is the pressure between the student and each of the nails?
Physics
College
Let E-> =3i^+1j^ and F -> =1i^3j^. (Note: the -> means it is above the letter!)A. Find the magnitude of E -> .B. Find the magnitude of F ->.C. Find the magnitude of G -> = E-> +F -> .D. Find the magnitude of H-> =E -> 2F -> .
Physics
High School
Define a change in quantity demanded, and describe what causes it
Physics
High School
How much power is used if it takes frank a 450 N boy 3 seconds to run 2 meters
Physics
High School
the (nonconservative) force propelling a 1.50 103-kg car up a mountain road does 4.30 106 j of work on the car. the car starts from rest at sea level and has a speed of 24.0 m/s at an altitude of 2.10 102 m above sea level. obtain the work done on the car by the combined forces of friction and air resistance, both of which are nonconservative forces.
Physics
High School
a proton is accelerated in a cyclotron to a very high speed that is known to within . what is the minimum uncertainty in its position?
Physics
High School
A slanting line was obtained on plotting the displacment-time graph of an object. The object is in ____________ motion.
Physics
High School
the tortoise and the hare are running a 1 km race. after running comfortably for 7 s, the hare is so far ahead that he decides to take a nap under a tree, 100 m away from the finish line. if the tortoise is moving constantly at a speed of 0.27 m/s, and the maximum speed of the hare is 15 m/s, how long can the hare afford to nap if he does not want to lose the race?
Physics
High School
which of these can help determine air pressure? select the two correct answers.a. wind speed of the airb. moisture in the airc. temperature of the aird. cloud patterns in the air
Physics
High School
as an example, a 3.90- kg aluminum ball has an apparent mass of 2.50 kg when submerged in a particular liquid: calculate the density of the liquid.
Physics
College
the way an object appears to move across the sky defintion
Physics
High School
The lowest note on a grand piano has a frequency of 27.5 Hz. The entire string is 2.00 m long and has a mass of 420 g. The vibrating section of the string is 1.60 m long. What tension is needed to tune this string properly?
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