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A quarterback throws a pass that is a perfect spiral. In other words, the football does not wobble, but spins smoothly about an exis passing through eaach end of the ball. Suppose the ball spins at 7.7 rev/s. In addition, the ball is thrown with a linear speed of 19 m/s at an angle of 55 deg with respect to the ground. If the ball is caught at the same height at which it left the quarterback;s hand, how many revolutions has the ball made while in the air?
You drive on Interstate 10 from San Antonio to Houston, half the time at 60 km/h and the other half at 105 km/h. On the way back you travel half the distance at 60 km/h and the other half at 105 km/h.
A 120-V fish tank heater has a power rating of 112 W. Calculate the resistance of the heater and Calculate the current through the heater
What is a stopping distance
When the door is open and at rest, the door closer exerts a torque of 5.40 NxM. What is the least force that you need to be relevant to the door to hold it open.
You have a 1.3m long copper wire. You want to make an N-turn current loop that generates a 1.0mT magnetic field at the center when the current is 1.2A. What will be the diameter of your coil
Points A and B have electric potentials of 257 V and 129 V, respectively. When an electron released from rest at point A arrives at point C its kinetic energy is KE1, What is the electric potential at point C
A charged isolated metal sphere of diameter 10 cm has apotential of 8000 V relative to V = 0 at infinity. Calculate the energy density in the electric field
A block slides down an inclined plane, starting from rest and being pushed with a constant acceleration of 4.95 m/s2 over a distance of 18.2 cm. Find the total time the block is in motion
X rays of wavelength 0.0196 nm are directed in the positive direction of an x axis onto a target containing loosely bound electrons. determine the corresponding change in photon energy
A small object begins a free-fall from a height of H = 82.5 m at t0 = 0 s. At what height from the ground will the two objects first meet
A well-engineered ski jump is less dangerous than it looks because skiers hit the ground with very small velocity components perpendicular to the ground. What is the slope of the ground in the landing zone
A 10 kg block is set in motion upa 20 degree inclined plane with an initial speed of 8.0 m/s. find the distance up the surface of the plane the block will travel
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