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Question1
A lunar landing craft approaches the moon’s surface. Suppose that one-third of its weight is fuel, that exhaust velocity from its rocket engine is 1500 m/s, and that acceleration of gravity at the lunar surface is one-sixth of that at the earth’s surface. How long can craft hover over the moon’s surface before it runs out of fuel?
Question2
Planet Mercury (m = 0.3301 x 10^24 kg ) is in a circular orbit about the sun (M = 1.989 x 10^30 kg ) at r = 57.91 x 10^6 km. demonstrate that this slight shortening of period amounts to the observed precession (gradual rotation of the semi-major axis ) of Mercury's orbit that is 43 seconds of arc per century. This contract between Einstein's calculations and observed precession was one early piece of proof confirming Einstein's relativity.
A 1000-kg car travelling at a speed of 32 m/s skids to a halt on wet concrete where f_k = 0.3. How long are the skid marks.
Laser light with a wavelength lambda = 660nm illuminates a pair of slits at normal incidence.
A 3 kg object id released from rest at a height of a 5 meter curved frictionless ramp. At the foot of the ramp is a spring force constant of k= 400n/m the object slides down the ramp and onto the spring compressing it to the distance x before comi..
A 0.38-kg cord is stretched between two supports,7.6m apart. When one support is struck by a hammer, What is the tension on the cord
What is the terminal speed for an 76.0kg skier going down a 38.0? snow-covered slope on wooden skis ?k= 0.060
A charge of -3.55 nC and a charge of -5.65 nC are unconnected by a distance of 60.0 cm. Find the position at which a third charge of +7.20 nC can be located so that the net electrostatic force on it is zero.
You measure an electric field of 1.37×106N/C at a distance of 0.159m from a point charge. What is the electric flux through the surface of a sphere
On a part-time job, you are asked to bring a cylindrical iron rod of density 7800kg/m3, Calculate the weight of the rod, w
A wheel (radius = 0.20 m) is mounted on a frictionless, horizontal axle. A light rope wrapped around the wheel supports a 0.50-kilogram object, as shown below. When released from rest, the object falls with a downward acceleration of 5.0 m/s2. What i..
What are the two main mechanisms that the planet Earth uses to balance water that goes up with the water that comes down over Earth.
An infinitely long wire is formed as in the diagram on your assignment. It is formed so that it has a circular portion of R = 50cm and the straight portion is located at a distance r from the center of the circular portion. Determine r (in cm) suc..
A 57 kg tightrope walker stands in the middle of a rope. Her weight makes the rope sag, evaluate the rope tension
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