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Q1. a car with a mass 1865 kg is travelling west and slows down uniformly to 8.5 m/s over a distance of 108 m. calculate the initial speed of the car if the required braking force is 7525 N
Q2. During its evolution, a star of 1 solar mass (the mass of our Sun) expands to 3.33 times its original radius.
suppose that, during this expansion:
- star has no appreciable loss of mass- mass is uniformly distributed through the volume- star remains spherical during the entire process
a) If the star was initially spinning with a period of To = 36.9 days: find Tf, the period of rotation of the star after the expansion 1 days
b) compute the ratio R., where
R = (final kinetic energy of the star)/(initial kinetic energy of the star)
Which vector has the largest x component and y component
A doubly charged helium atom whose mass is 6.6 10 to 27 kg is accelerated by a voltage of 2200 V. What will be its radius of curvature if it moves in the plane perpendicular to a uniform 0.308 T field?
What is current temperature and peak wavelength What is the proper description of their situation
What is the maximum amount of energy the incident electron can lose in elastically in this collision? What is left over energy of the electron.
Two boats start together and race across a 62-km-wide lake and back. Boat A goes across at 62 km/h and returns at 62 km/h. Boat B goes across at 31 km/h, and its crew, realizing how far behind it is getting, returns at 93 km/h.
An aquarium contains a 5-cm layer of water (n = 1.333) floating on top of carbon tetrachloride (n = 1.461). If an angle of incidence into water from the carbon tetrachloride is 20, what is the angle of refraction into the air.
What is rms speed of the atoms at temperature
What fraction of the initial kinetic energy was transferred
What is the mass of sculpture (in kg) assume that the local acceleration due to gravity is 9.80 m/s2.
Find the magnitude of total displacement of the object
Find the angle with respect to the ground
What is swimmer velocity relative to the bank
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