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Question: A speedboat increases its speed uniformly from 20 m/s to 30 m/s in a distance of 200m. Find (a) the magnitude of its acceleration and (b) the time it takes the boat to travel the 200-m dis
The car drives straight off the edge of a cliff that is 57 m high. The investigator at the scene of the accident notes that the point of impact is 130 m from the base of the cliff. How fast was the
Question: It takes you 9.5 minutes to walk with an average velocity of 1.2 m/s to the north from the bus stop to museum entrance. What is your displacement?
In reaching her destination, a backpacker walks with an average velocity of 1 m/s, due west. This average velocity results, because she hikes for 6 km with an average velocity of 3 m/s due west, tur
Knowing that the tension in the cable is 1125N(the force in BG=BH=1125N), determine the moment about the digonal AD of the force exerted on the frame by the BH cable?
We drive a distance of 1 km at 16 km/h. Then we drive an additional distance of 1 km at 32 km/h. What is our average speed?
A box sits on a horizontal wooden board. The coefficient of static friction between the box and the board is 0.5. You grab one end of the board and lift it up, keeping the other end of the board on
A proton is between the plates and has an acceleration of magnitude 1.40×10^11m/s^2 . Find the magnitude of the charge density on the plates. Express your answer with the appropriate units.
What must the charge (sign and magnitude) of a particle of mass 1.42g be for it to remain stationary when placed in a downward-directed electric field of magnitude 610N/C ? Use 9.81m/s^2 for the mag
About Simple Harmonic Motion (SHM) is wrong:
Calculate the force of attraction (in N) between a cation with a valence of +4 and an anion with a valence of -1, the centers of which are separated by a distance of 6.1 nm.
A large plane having uniform charge density has an electric field just outside the plane that points directly toward the plane with magnitude 1.45×10^4N/C . What is the surface charge density?
Find the maximum wavelength (nm) of ultraviolet light (in air) for which the reflection will be maximized instead of minimized.
Calculate the energy of attraction (in eV) between a cation with a valence of +2 and an anion with a valence of -1, the centers of which are separated by a distance of 7.1 nm.
List and explain briefly similarities and differences between the electric force between two charges and the gravitational force between two masses.
Two small charged balls have a repulsive force of 0.12N when they are separated by a distance of 0.70m. The balls are moved closer together, until the repulsive force is 0.70N. How far apart are the
A proton is at the origin and an electron is at the point x= 0.35nm , y= 0.34nm. Find the electric force on the proton.
Question: A 7.10 nC charge is located 1.76 m from a 4.14 nC point charge. (a) Find the magnitude of the electrostatic force that one charge exerts on the other.
Power plant that uses the temperature gradient of the ocean has been proposed. The system is to operate between 21°C (surface temperature) and 6°C (water temperature at a depth of about 1 km
Question: A heat engine operates in a Carnot cycle between 76.0°C and 355°C. It absorbs 21000 J of heat per cycle from the hot reservoir. The duration of each cycle is 3.00 s. (a) What is th
A gas is compressed at a constant pressure of 0.270 atm from a volume of 8.00 L to 5.00 L. In the process, 400 J of heat energy flows out of the gas. (a) What is the work done by the gas? (b)
The efficiency of a Carnot engine is 27%. The engine absorbs 795 J of heat per cycle from a hot reservoir at 499 K. Determine the heat expelled per cycle and the temperature of the cold reservoir.
A gas is compressed at a constant pressure of 0.320 atm from a volume of 8.00 L to 5.00 L. In the process, 400 J of heat energy flows out of the gas. What is the work done by the gas? What is the ch
Question: Explain whether Mars was visible from your location at midnight on December 3, 1999. (When it is midnight at your location, the sun is on the opposite side of the earth from you.)