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A tuning fork with a frequency of 440Hz is held just above the top of a uniform glass tube containing water, What is the speed of sound in air
A long straight ideal solenoid of radius 6 cm, with 150 turns/m passes (on axis) through the center of a flat circular coil, What is the total flux across the coil, as a function of time
A boy catches - with bare hands and his arm extended - a 0.16 kg baseball coming directly toward him ar a speed of 25 m/s. what is the average force the boy's hand feel while catching the ball
The heat capacity of the calorimeter itself was 883 J/K and it contained 830.1 g of water (c = 4.184 J/g.K). If the temperature increased by 13.2°C, what is ?E (in kJ) for the combustion of 1 mo
A 0.140-kg baseball is dropped from rest. It has a speed of 1.20 m/s just before it hits the ground. what is the average force exerted by the ground on the ball
A soccer ball with mass 0.285kg is initially at rest and is kicked at an angle of 22.8 (degrees) with respect to the horizontal. What is the impulse received by the soccer ball during the kick
SbCl3(s)+H2O(l) -> SbOCl(s)+2HCl(g) In this reaction what is the percentage of Cl in SbOCl and in 2HCl
A block of mass m = 4 kg slides back and forth on a frictionless horizontal track. It is attached to a spring with a relaxed length of L = 4 m, By what length is the spring extended
A 166 gram hockey puck has a initial velocity of vx = 27 m/sec and vy = 16 m/sec. What is the impulse delivered to the hockey puck in the x direction
A flask contains helium gas at 11K. The Flask is thermally isolated and the gas is allowed to escape slowly through a narrow tube until the pressure within the flask is 0,98 atm
Write the structural formula of the main organic product of the following reaction between an alcohol (CH3OH), tosyl chloride, and then a nucleophile (CH3S-).
An athlete whirls a 7.49 kg hammer tied to the end of a 1.3 m chain in a horizontal circle. What is the centripetal acceleration of the hammer
Given the information below calculate ?H°rxn for: C2H4(g) + 6F2(g) => 2CF4 + 4HF(g). H2(g) + F2(g) => 2HF(g) ?H° = -537 kJ C(s) + 2F2(g) => CF4(g) ?°H = -680 kJ 2C(s) + 2H2(g)
A 25.00 mL aliquot of iron solution was titrated to equivalence with 26.19 mL of 0.0215 M KMnO4. A procedure similar to the one in experiment 7 was followed. Calculate the moles of iron in the origi
The intensity (in W/m2) of one sound is 7.12 times as great as the intensity of another sound. Relative to the quieter sound
Draw a Lewis structure for one important resonance form of HNO3(HONO2). Include all one pair electrons.
A bicycle racer sprints at the end of a race to clinch a victory. The racer has an initial velocity of 13.0 m/s, What is his final velocity
How many hours are required for .235 mol of electrons to flow through ta circuit if the current is 1.68 A
A swimmer bounces straight up from a diving board and falls feet first into a pool. What is her velocity when her feet hit the water
Sharon has a mass of 60 kg and is standing on a giant skateboard that is initially at rest and has a mass of 30kg. what is the speed of the skateboard
At what pH would the given concentrations of Ce4+ (1.67*10^-4), Ce3+ (.185), Mn2+ (1.28x10^-5) and MnO4- (.148) be in equilibrium at 298 K. Chemical equation is 5Ce4+ + Mn2+ 4H2O => 5Ce3+ + MnO4-
A 2.20 kg hoop 2.00 m in diameter is rolling to the right without slipping on a horizontal floor at a steady 2.40{\rm rad/s}. What is the total kinetic energy of the hoop
A 4.0 kg mass and a 3.0 kg mass are attached to the opposite ends of a thin 42.0 cm long horizontal rod. determine the kinetic Energy of the system
A ping pong ball of mass 100 grams travelling at 10 m/s hits a stationary bowling ball of mass 3 kg, head on. determine the final velocities of both balls
At the beginning of 2013, an asteroid crashed in Russia, making for a very spectacular Youtube clip. determine the speed at which it crashed on the ground