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Q1. On an open field, a cannonball launches at the angle of 50° with respect to the ground. Some moment later, you observe that the cannonball is still in flight and on its way up. What can you affirm about the cannonball's velocity at that instant of time as compared to its initial velocity (at launch)? vx and vy stand for the x and y components of the cannonball's velocity, correspondingly (with x pointing parallel to the ground and y pointing up, as usual). Choose the best answer and give a short explanation for your choice.
a. Both vx and vy have not changed.b. Both vx and vy have increased.c. vx has decreased and vy has increased.d. vx has not changed and vy has decreased.e. vx has increased and vy has not changed.f. vx has increased and vy has decreased.
Q2. Work out the buoyant force due to the surrounding air on a man weighing 800 {rm N}. Imagine his average density is the same as that of water, and surrounding air temperature is 0 rm ^circ C.
An object of mass m1 = 2.10 kg placed on a frictionless, Draw free-body diagrams of both objects, This answer has not been graded yet
Thor throws his war hammer at an 1800 kg car initially at rest and it becomes embedded within it. with what speed do the car and hammer move just after the collision
A microwave oven of mass 12.5kg is pushed a distance 8.00m up the sloping surface of a loading ramp inclined at an angle of 36.2? above the horizontal, What is the work done on the oven by the force
A projectile is shot horizontally at 65.3 m/s from the roof of a building 24.4 m tall. Determine the distance from the base of the building that the projectile lands
each second 5e23 nitrogen molecules (m=4.65e23 g) collide with a 10cm2 wall assume that the molecules all travel with a common speed of 290m/s, What is the pressure on the wall
Find distances between the lens and the film
How much time has elapsed between the two measurements.
A sled is pulled with a horizontal force of 20 N along a level trail, and the acceleration is found to be 0.35 m/s2. An extra mass m = 4.2 kg is placed on the sled. If the same force is just barely able to keep the sled moving, what is the coeffic..
A 62 kg person on skis starts from rest down a hill sloped at 40° from the horizontal. The coefficient of friction between the skis and the snow is 0.10.
A long solenoid that has 1,190 turns uniformly distributed over a length of 0.420 m produces a magnetic field of magnitude 1.00 multiply.gif 10-4 T at its center
With a particular grating a doublet of the two wavelengths 731.3 and 732.1 nm is viewed in the third order at 9.3° to the normal, find the grating spacing in nanometers
A small object, which has a charge q = 7.4 µC and mass m = 9.85 10-5 kg, is placed in a constant electric field. Determine the magnitude of the electric field
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