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Q. An 800-N man stands halfway up a 5.0-m long ladder of negligible weight. The base of the ladder is 3.0m from the wall as shown. Assuming that the wall-ladder contact is frictionless, the wall pushes against the ladder with a force of what magnitude?
Q. Two events in reference frame S occur 10 mus apart at the same point in space. The distance between the two events is 2400 m in reference frame S' .
What is the time interval between the events in reference frame {rm S} ' ?
What is the acceleration of the truck. If it starts 4.50 m from the lower edge of the roof, how fast would the toolbox be moving just as it reaches the edge of the roof if the kinetic friction force on it is 18.0 N.
A 59.0 kg pole vaulter running at 9.5 m/s vaults over the bar. If the vaulter's horizontal component of velocity over the bar is 1.5 m/s and air resistance is disregarded, how high was the jump.
Two people are carrying a uniform wooden board that is 3.00 m long and weighs 160 N. If one person applies an upward force equivalent to 60 N at one end, at what point does the other person lift . If the tangential acceleration of a yo-yo at the en..
A friend of yours is loudly singing a single note at 411 Hz while racing toward you at 25.5 m/s on a day when the speed of sound is 341 m/s.
Astronomers discover a binary star system that has a period of 93.0 days. The binary star system consists of two equal-mass stars, each with a mass twice that of the sun, that rotate like a dumbbell about the centre of mass at the midpoint between..
Express how unmet basic physiological needs of oxygen, nutrition, temperature, and humidity threaten clients' safety.
The electricity received at an electric substation has a potential difference of 2.80 10^5V. If the requires output is 440V, what must be the ratio of the turns of the step-down transformation.
A standard baseball has a circumference of approximately 23 cm. If a baseball had the same mass per unit volume as a neutron or a proton, about what would its mass be?
A potential difference of 81 mV exists between the inner and outer surfaces of a cell membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a positive sodium ion (Na+) from the interior of the ce..
What is the potential difference measured by voltmeter
An LR circuit is hooked up to a battery as shown in the figure, with the switch initially open. The resistance in the circuit is R=120Ω, the inductance is L=4.10H, and the battery maintains a voltage of E=49V. At time t=0 the switch is closed.
A woman is reported to have fallen 139 ft from a building, landing on a metal ventilator box, which she crushed to a depth of 30 in. She suffered only minor injuries.
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