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A wooden raft has a mass of 55 kg. When empty it floats in water (1000kg/m3) with 64% of its volume submerged. What mass of sand can be put on the raft without it sinking?
A helium ion (Q = +2e) whose mass is 6.6×10?27kg is accelerated by a voltage of 3700V, What is its speed? Express your answer to two significant figures and include the appropriate units
An archer shoots an arrow toward a 300 g target that is sliding in her direction at a speed of 3.50 m/s on a smooth,slippery surface. The 32.5 g arrow is shot with a speed of35.0 m/s and passes through the target, which is stopped by the impact.
two particles with Q1=50uc and Q2=84uc are initially separated by a distance of 2.3m, what is the change in electric potential energy
a parallel-plate capacitor with area 0.900 m2 and plate separation of 1.00 mm is connected to a 15.00-v battery.a what
Estimate the percent change in mass δm/m of a block of copper which is heated from 300 K to 400 K. The molar speci?c heat of copper is cP = 2.6·104 J/kmol·K and, its atomic weight is 29.
As a space craft approaches a planet, the rocket engines on it are fired to slow it down so it will go into orbit around the planet. how long must the engines be fired
A very small circular metal ring of radius r=0.5cm and resistance x=5ohms is that the center of a large concentric circular metal ring of raduis R=50cm, What is the magnitude and direction of the average current in the small ring
A uniform circular plate of radius 15 cm has a circular hole of radius 3 cm cut out of it. If the mass per unit area of material is 5 g/cm2, what is the mass of this object
We can approximate an electron moving in a nanowire as a one-dimensional infinite square-well potential. Let the wire be 2 μm long. The nanowire is cooled to a temperature of 13K, What are the three lowest energy levels of the electrons
A 0.410-kg blue bead slides on a frictionless, curved wire, Find the maximum height the green bead rises
A 151 kg car rounds a curve of radius 163 m at 46 m/s. The acceleration of gravity is 9.8 m/s2 . What force must the road exert on its tires to hold the car on course? find out its speed when it has moved?
A mass M of 1.19 kg is attached to the end of a string whose length is 0.650 m. The mass slides without friction on a horizontal surface as indicated. If the string can withstand a maximum tension of 55.5 N, what is the maximum tangential speed th..
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