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A river flows due eat at 1.50 m/s. A boat crosses the river from the south shore to the north shore by maintaining a consatnt velocity of 10.0 m/s due north relative to the water. a. What is the ve
If a star moves in a wobbly fashion [ as seen through a telescope], why does this motion suggest a planet is nearby? Why is the middle seat on a plane/bus the most comfortable during a bumpy ride ?
. Additionally, the whole system rotates with frequency Ω around the vertical axis through the center of the axle. What is the largest value of Ω for which both wheels stay on the ground
To maintain the temperature inside a house at 20° C, the electric power consumption of the electric baseboard heaters is 30.7 kW on a day when the outside temperature is -6° C. At what rate
A flight attendant pulls her 60 N flight bag a distance of 358 m along a level airport floor at a constant velocity. The force she exerts is 38 N at an angle of 50° above the horizontal.
The working substance of an engine is 1.00 mol of a diatomic ideal gas. The engine operates in a cycle consisting of three steps: (1) an adiabatic expansion from an initial volume of 11.0 L to a pres
A heat engine absorbs 120 J of heat from the hot reservoir and releases 60 J of heat to the cold reservoir during each cycle. (a) What is its efficiency? (b) If each cycle takes 0.50 s, find the power
Snowballs are thrown with a speed of 18 m/s from a roof 9.0 m above the ground. Snowball A is thrown straight downward; snowball B is thrown in a direction 30^\circ above the horizontal. What is the
A proton is placed midway between point A and B. The potential at point A is -20 V and the potential at Point B +20 V. The potential at midpoint is 0 V. The proton will
Light traveling in air strikes a transparent material, making an angle of 17.000o with respect to the INTERFACE. The index of refraction of the material is 1.106. What's the angle of refraction for
A copper cable is designed to carry a current of 260 A with a power loss of 1.70 W/m. What is the required radius of this cable?
The bullet strikes the board with a speed of 500 m/s and emerges with a speed of 290 m/s. (To simplify, assume that the bullet accelerates only while the front tip is in contact with the wood.) (a)
The electrons in a beam are moving at 2.6 ×108 m/s in an electric field of 16000 N/C. What value must the magnetic field have if the electrons pass through the crossed fields undeflected?
A defibrillator consists of a 15.4-µF capacitor that is charged to 8.2 kV. What is the average power delivered to the tissues?
Two parallel wires are 7.4 cmapart, and each carries a current of 13.2 A. If the currents are in the same direction, find the force per unit length exerted by one of the wires on the other. The perm
What is the magnitude of the object's acceleration after it is released (relative to the ground)?
What is the final velocity just before hitting the ground and magnitude in relation to the ground? Thank you for any help. Of course we are using 9.8 m/s for gravity and no air drag in this problem.
If the particle has a speed of 8.40 m/s on surface A and arrives at surface B with a speed of 8.80 m/s, how much work is done by the outside force in moving the particle from A to B?
If the particle has a speed of 8.40 m/s on surface A and arrives at surface B with a speed of 8.80 m/s, how much work is done by the outside force in moving the particle from A to B? (This work is p
A subway train starts from rest at a station and accelerates at a rate of 1.54 for 14.2 . It runs at constant speed for 69.7 and slows down at a rate of 3.48 until it stops at the next station. find
When the ball is directly over the net, what is the distance between them? Express your answer in terms of the given variables and the gravitational acceleration g.
A block with a mass m and charge q is placed in an electric field E= Ai + Bj where A and B are constants. If the block is released from rest at the origin at time t = 0, what are its (a) x, (b) y, a
At what temperature does the rms speed of (a) a nitrogen molecule and (b) a hydrogen molecule equal the escape speed from the earth's surface?
A passenger walks from one side of a ferry to the other as it approaches a dock.Passenger's velocity is 1.45 due north relative to the ferry, and 4.40 at an angle of 30.0 west of north relative to
Two waves traveling along a stretched string have the same frequency, but one transports seven times the power of the other. What is the ratio of the amplitudes of the two waves?