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A block with mass of 2.00 kg slides across a horizontal frictionless counter. It then runs into and compress a spring of spring constant k = 100 N/m. After a compression distance of 30 cm. its speed reduced to 5.00 m/s. What is the initial speed of the block before it compresses the spring
Determine the emf generated in a coil with 12 turns of wire and an area of (1.30 m2) that was initially at rest in a uniform external magnetic field with strength of 1.90-T
A jet airplane is in level flight. The mass of the airplane is m = 8910 kg. What is the magnitude of the lift force acting on the plane
A hollow metal sphere, radius 5 cm, has a charge of 2e-7 Coulombs placed on it. Find the flux of electric field through a closed spherical surface
A molecule of DNA (deoxyribonucleic acid) is 2.14 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. Determine the effective spring constant of the molecule
An object attached to a horizontal spring is oscillating back and forth along a frictionless surface. Determine how much time elapses between an instant when the object's speed is at a maximum and the next instant when its acceleration is at a maxi..
A piece of rock weighs 301 N in air and has an apparent weight of 202 N when suspended under water. What are the volume and density of the rock
A pendulum of mass 0.4kg and length 0.6 m is pulled back and released from and angle of 10o to the vertical. This same pendulum is taken to another planet where its period is 1.0 second. What is the acceleration due to gravity on this planet?
In each of two coils the rate of change of the magnetic flux in a single loop is the same. The emf induced in coil 1, which has 206 loops, is 2.60 V. The emf induced in coil 2 is 3.57 V. How many loops does coil 2 have?
At time t, r→ = 5.70t2 - (3.20t + 3.90t2) j gives the position of a 3.0 kg particle relative to the origin of an xy coordinate system ( r→ is in meters and t is in seconds). Find the torque acting on the particle relative to the origin at the moment ..
A charge of +2?C and 6 mg is fired directly upward at a speed of 500 m/s. The charge reaches the top of its trajectory at 30 m. Ignoring gravity, find the magnitude and direction of the electric field necessary to accomplish this.
A guitar string has a length of 0.540m with a tension such that the wave speed on this string is 126m/s.
A racetrack is to have a banked curve with radius 225 m. What should be the angle of the bank if the normal force alone is to allow safe travel around the curve at 56.0 m/s
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