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Q1. When a 0.5 kg mass is suspended from a spring, the spring stretches 4 cm. The mass is then displaced 2 cm from its equilibrium position and released. a) What is the spring constant? b) What is the mechanical energy of the mass? c) What is the speed of the mass as it passes through its equilibrium position going down and going up?
Q2. The power output of a cyclist moving at a constant speed of 6.0 m/s on a level road is 120 W. a) What is the frictional force exerted by her (and the bicycle) by the air? b) By bending low over the handlebars, the cyclist reduces the wind resistance by 18N. If she maintains her former power output, what will her speed be?
Q3. A girl throws a 0.2 kg ball a distance of 6 m straight up in the air (assume no air resistance). a) What is the kinetic energy of the ball as it leaves the girl's hand? b) How much work does the girl do in throwing the ball? c)If the girl's arm muscle contracted a distance of 0.050 m while throwing the ball, what was the average force exerted by the muscle.
Click on the Energy vs. Position button to see a plot of the kinetic, potential, thermal, and total energies as a function of the skater's position. Try Bar Graph to see the same information as a bar graph. For this tutorial, you should have the C..
work of 600 j is done by stirring and insulated beaker containing 100 gm of water?what is the internal enery of the
A motorcycle has a constant speed of 27.7 m/s as it passes over the top of a hill whose radius of curvature is 168 m. determine the normal force that acts on the cycle
During a crash test, a car moving at 60 km/ hr collides with a rigid barrier and comes to a complete stop in 200 ms, Find the total impulse imparted by the collision, Find the average collisional force
A pitcher throws a 0.140-kg baseball, and it approaches the bat at a speed of 50m/s. The bat does Wnc = 70J of work on the ball in hitting it. Ignoring air resistance, determine the speed of the ball after the ball leaves the bat and is 25.0 m abo..
If 62.9 L of oxygen at 18.0°C and an absolute pressure of 2.28 atm are compressed to 56.5 L and at the same time the temperature is raised to 50.0°C, What is the average translational kinetic energy of a nitrogen molecule at STP
A 1000-turn coil of wire that is 2.4cm in diameter is in a magnetic field that drops from 0.12T to 0T in 11ms. What is the emf of the coil
If a material increases it's length from 160m to to 163.20m when it's temperature is raised 160 degrees C, determine the coefficient of linear expansion
A block (mass = 1.8 kg) is hanging from a massless cord that is wrapped around a pulley (moment of inertia = 1.2 x 10-3 kg·m2), find the angular acceleration of the pulley
A simple harmonic oscillator consists of a block of mass 4.kg attached to a spring of spring constant 153 N/m. When t = 2 s, the position and velocity of the block are x = +0.129 m and v = +3.415 m/s.
a manufacturer of fasteners uses a four die nut former to produce blanks and the piercer punch began to break down
A helium gas cylinder has a pressure of 28 atm. What fraction of the original amount of helium remains in the cylinder
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