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Physics
An airplane accelerates down a runway at 3.20 m/s2 for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff.
Physics
A spring of mass, m, oscillates with a frequency, f. Find an expression for the angular velocity, w. Also find the solution in form of x(t)
Physics
Calculate the pressure exerted on an elevator floor which is 2 meters length and 3 meter wide, if 2 people whose combined mass is 160 kg are standing on it. (g = 10 m/s2)
Physics
a car of mass 1250 kg and a bus of mass 5000 kg are moving with eqaul linear momentum. find the ratio of their kinetic energies
Which path should the lifeguard follow to reach the drowning person in minimum time?
Physics
A man observing from an upper floor of a building sees a boy looping a ball in a cord. If the cord breaks, what path will the ball take? Explain your answer.
Physics
1. Find the central force acting on a 1,100 kg car traveling at 27 m/s around a high way curve of radius 150 m.
1. A car speeds around an 80-m radius curve of a freeway. A 60 kg passenger holds the armrest of the car door with a force of 220 N so as not to slide or thrown away. Disregarding friction, determine the cars speed in km/h.
Determine the image distance for an 11.3 m tall object placed 45.0 m from a concave mirror having a focal length of 83.1 m. *
The force of friction between an object and the surface upon which it is sliding is 15N. The mass of the object is 20kg. What is the coefficient of kinetic friction?
Physics
a. Explain how a medical linac can be used in either an electron mode or photon mode for the
treatments of cancer patients. Then explain why an x-ray tube can only have a photon mode.
b. Which of the following two beams is a better approximation to an isotropic source: a 100 kV
beam from an x-ray tube or a 4 MeV photon beam from a medical linac? Explain briefly the
reason for your choice.
c. Another type of particle accelerator is a cyclotron which can be used to produce medical
radioisotopes. Suppose one of these devices accelerates protons to 6.5 MeV. If the magnetic
field in the cyclotron is 1.2 T, then what is the diameter of the largest orbit, just before the
protons exit the cyclotron
treatments of cancer patients. Then explain why an x-ray tube can only have a photon mode.
b. Which of the following two beams is a better approximation to an isotropic source: a 100 kV
beam from an x-ray tube or a 4 MeV photon beam from a medical linac? Explain briefly the
reason for your choice.
c. Another type of particle accelerator is a cyclotron which can be used to produce medical
radioisotopes. Suppose one of these devices accelerates protons to 6.5 MeV. If the magnetic
field in the cyclotron is 1.2 T, then what is the diameter of the largest orbit, just before the
protons exit the cyclotron
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#340153 on Dec 2023
#340153 on Dec 2023