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A 3kg block is on a slope, 30 degrees to the horizontal, and (because of friction) is stationary. What is the net force on the block (in Newtons)
A motorized wheel is spinning with a rotational velocity of ω0 = 1.41 rad/s. At t = 0 s, the operator switches the wheel to a higher speed setting. The rotational velocity of the wheel at all subsequent times is given by where c = 1.5574 and b = 6..
A 1000 kg weather rocket is launched straight up. The rocket motor provides a constant acceleration for 16 s, What is the rocket's speed as it passes through acloud 6200 m above the ground
A ball attached to a string starts at rest and undergoes a constant angular acceleration as it travels in a horizontal circle of radius 0.30 meter. Evaluate the tangential acceleration of the ball
A copper wire has a 25-m ohm resistance at 20 C. When the wire is carrying a current, heat produced by the current causes the temperature of the wire to increase by 27 C. What is the change in the wire's resistance
An outside loudspeaker (considered a small source) emits sound waves with a power output of 120 W. Find the intensity level in decibels at that distance
Suppose L1 has a focal length of -5 cm. This is in direct contact with a second lens named L2. If an object is placed 5 cm from the lens combination, the resulting magnification is seen to be M=-10. Find the focal length of the second lens in ..
In order to study the long-term effects of weightlessness, astronauts in space must be weighed (or at least "massed"). Find the mass of the astronaut
A force F= (6x - 2y)N acts on a particle that undergoes a displacement delta r= (3x + y)m. Find (a) the work done by the force on the particle and (b) the angle between F and r.
If the difference in pressure on the two sides of a closed door of area 2m^2 is 0.01 atm, what is the net force on the door
A 2 C charge and a 8 C charge repel each other with 10 N of force. How much will a 4 C charge and a 4 C charge repel each other when placed the same distance apart? Electrons are accelerated to reach a kinetic energy of 250 eV (= 4.0 x 10-17 J). If t..
An object of mass 6.0 kg is thrown vertically upwards from ground level with an initial speed of 20 m/s. What is its speed when it reaches one-half of its maximum height?
A race track is to have a banked curve with radius250 m. What should be the angle of the bank if the normal force alone is to allow safe travel around thecurve at 59.5 m/s
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