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A 47.3-kg skater is standing at rest in front of a wall. Bypushing against the wall she propels herself backward with avelocity of -2.41 m/s. Her hands are in contact with the wall for1.19 s. Ignore friction and wind resistance. Find the average force she exerts on the wall (which has the same magnitude, but opposite direction, as the force that the wall applies to her). Note that this force has direction, which you should indicate with the signof your answer.
What observed rotation is expected when 1.26M solution of (R)-2-butanol is mixed with an equal volume of a 0.630 M solution of racemic 2-butanol, and the resulting solution is analyzed in a sampling container that is 1 dm long
A poorly tuned Yugo can accelerate from rest to a speedof 28 m/s in 20 s. What is the average acceleration of the car
The drawing shows a collision between two puckson an air-hockey table. Puck A has a mass of 0.0190 kg and ismoving along the x axis with a velocity of +4.63 m/s. It makes acollision with puck B, which has a mass of 0.0380 kg and isinitially at res..
Using the elements sodium, potassium, calcium, magnesium, carbon, oxygen, nitrogen, fluorine, chlorine, iron, hydrogen and sulphur, provide some key features of the periodic table such as: How they are organised in groups, periods and blocks
A 9.0 ohm resistor and a 6.0 ohm resistor are connected in series with a power supply. Find the voltage setting of the power supply
A lazy Susan consists of a heavy plastic disk mounted on africtionless bearing resting on a vertical shaft through itscenter. The cylinder has a radius R = 10 cm and mass M = 0.23 kg. A cockroach (mass m = 0.015 kg) ison the lazy Susan, at a dista..
The magnetic field of the earth at a certain location is directed vertically downward and has a magnitude of 50.0 µT. A protonis moving horizontally toward the west in this field with a speedof 6.50*106 m/s.
A 67.5 kg circus performer slides4.10 m down a pole to the circusfloor, starting from rest. What is the kinetic energy of the performer as shereaches the floor
What is the major event that has changed world in the book The Road - what is being dreamt about? What is overall feeling concering dreams?
Two ants race across a table 66 cm long. One travels at4.42 cm/s and the other at 3cm/s. When the first one crosses thefinish line, how far behind is the second one
Residents of Hawaii are warned of the approach of a tsunami (tidal wave) by sirens mounted on the top of towers. Treating the siren as a point source of sound, and ignoring reflections and absorption, find the intensity level of one siren heard by a..
two parallel plates are separated by a distance of 25mm. the potential difference across the plates is 500v, what is the change in kinetic energy of the electron in electron volts
What is the minimum cross-sectional area required of a vertical steel cable from which is suspended a 270 kg chandelier, If the cable is 7.5 m long how much does it elongate
In Europe, a large circular walking track with a diameter of 0.900 km is marked in angular distances in radians. How many radians should he walk per day to maintain his daily routine
A ball hangs motionless from a ceiling by a string. How many forces are acting on the ball
Half-life of C^14 is 5730 yr. Find its decay constant. If we have 4.8X10^14 atoms of C^14, after 10000yr. How many of them will be left
A railroad car of mass 4.0 * 10^4 kg moving at 5.0 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.50 m/s.
A laser pulse has a duration of 4.00× 10?11 s and a frequency of 6.40× 1014 Hz. How many cycles of wave are in the pulse
The plates of a parallel-plate capacitor are charged to a potential difference of 12.0 V. If the capacitance is 15.0 µF, calculate the energy stored in the capacitor
Determine the capacitance of a Teflon-filled parallel-platecapacitor having a plate area of 1.90cm2 and insulation thickness of 0.0100 mm. What is the maximum voltage that can be applied to the capacitor?
Consider an insulated enclosed volume of 27m^3 containing dry air at 23 degrees celsisus and 980mb, What is the specific volume and mass of the air sample
Motor M draws in the cable with an acceleration of 4 ft/s^2, measured relative to the 200 lb mine car. Determine the acceleration of the car and the tension in the cable. avoid the mass of the pulleys.
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