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A block weighing 22 Newton is held at rest against a vertical wall by a horizontal force of magnitude 60 N. The coefficient of static friction between the block and the wall is 0.55, and the coefficient of kinetic friction between them is 0.38. In six experiments, a second force is applied to the block and directed parallel to the wall with the magnitude and 34 N, and up. Calculate the frictional force and the acceleration on the block, including sign?
What is the new frequency of the string that was tightened. find the magnitude of the net force acting on the car during this time.
When a certain element is bombarded with high-energy electrons, Determine the atomic number Z of the element.
What is the electrical potential at the surface of a gold nucleus? The radius is 6.6 x 10-15 m and the atomic number Z = 79
In opening the door, a person pushes at a point on the door 65 cm from the hinges with a force of 50 N that is directed at an angle of 75 degree with respect to the surface of the door
Now a peg is placed 4/5 of the way down the pendulum's path so that when the mass falls to its vertical position it hits and wraps around the peg. As it wraps around the peg and attains its maximum height it ends a distance of 3/5 L below its startin..
a projectile is launched with an initial velocity of 80 ms at an angle of 30ordm above the horizontal. neglecting air
A 2.50g ice flake is free from the edge of a hemispherical bowl whose radius r is 31 cm. The flake-bowl contact is frictionless. What is the speed of the flake when it reaches the bottom of the bowl?
Explain the function of the activator added in trace quantities to many inorganic scintillators. Why are activators not needed in organic scintillators?
lake erie contains roughly 4.00 x 1011 m3 of water.a how much energy is required to raise the temperature of that
A test rocket is firedvertically upward from a well. A catapult gives it an initial speedof 79.8 m/s at ground level. Its engines then fire and itaccelerates upward at 4.10 m/s2 until it reaches an altitude of1060 m.
a solid disk of mass m3kg and radius r.05m rotates around an axis which is perpendiuclar to the plane of the disk and
The position of a particle moving along the x axis is given by x = (32 + 40t - 8.0t2) m, where t is in s. What is the average velocity during the time interval t = 1.0 s to 3.0 s?
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