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A meter rule is balanced at the 70 cm mark by placing a 200-g mass at the 80 cm mark. At what point will the ruler balance if the 200-g mass is moved to the 90 cm mark? Two blocks of masses 15kg and 25kg are on a double inclined plane connected by a rope. What is the tension on the rope connecting the two masses? What is the acceleration of the two-mass system? A crate weighing 9800 N is pulled up a 37o incline by a pulley system. If the coefficient of kinetic friction between the crate and the plane is 0.75 N, what is the total force that opposes its motion up the plane?
An air-traffic controller observes two aircraft on his radar screen. The first is at altitude 750 m, What is the distance between the two aircraft
A pinball bounced around its machine before resting between two bumpers. determine the total displacement\'s magnitude and direction
In seawater, a life preserver with a volume of 4.00×10?2m^3 will support a 72.0kg person (average density 980kg/m^3 ), compute the density of the material composing the life preserver
A ball of mass m moving with velocity v_i_vec strikes a vertical wall. What is the final angle theta_f that the ball's velocity vector makes with the negative y axis
The hot glowing surfaces of stars emit energy in the form of electromagnetic radiation. It is a good approximation to assume e=1 for these surfaces. Find the radius of the star
A horizontal beam of electrons initially moving at 3.9 107 m/s is deflected vertically by the vertical electric field between oppositely charged parallel plates as shown in the diagram. The magnitude of the field is 1.70 104 N/C.
The lenses used in a compound microscope have powers of + 90D and + 60D . If a total magnification of -250x is desired, what should be the distance between the two lenses
A swimming pool has dimensions 29 m x 34 m and a flat bottom, what is the total force due to the water on the bottom
The average density of the planet Venus is 5219 kg/m3. The acceleration of gravity on its surface is 8.84 m/s2. Calculate the average radius of Venus
A tennis ball of mass m=0.057kg and speed v=24 m/s strikes a wall at a 45 degrees angle and rebounds with the same speed at 45 degrees. What is the direction of the impulse given to the ball
A typical adult ear has a surface area of about 2.10 10-3 m2. The sound intensity during a normal conversation is about 3.20 10-6 W/m2 at the listener's ear. How much power is intercepted by the ear
A particle with charge +3 nC is located at position A. Another particle with charge -4 nC is located at position B. What is the magnitude of the electric field at location B
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