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One swimmer in a relay race has a 0.30 s lead and is swimming at a constant speed of 6.0 m/s. He has 50 m to swim before reaching the end of the pool. A second swimmer moves in the same direction as the leader. What constant speed must the second swimmer have in order to catch up to the leader at the end of the pool?
the mass of a star is 1.71middot1031 kg and it performs one rotation in 34.1 days. find its new period in days if the
A 100-g cube of ice at 0 C is dropped into 1.00 kg of waterthat is originally at 80.0 C. What is the final temperature of the water after it is melted
An electron orbiting a hydrogen atom has an initial energy of -0.544 eV. The atom emits a photon, then absorbs a photon, What was the wavelength of the emitted photon
The magnetic flux through a 50-cm-long solenoid that has 500 turns of radius 3.0 cm is 3.0 × 10-2 Wb. Calculate the current through the solenoid
A wooden cylinder of length 2.0m and cross section 78cm^2 is suspended in vertical positionwith a string of length 2.5m. Find the linear density of the string
A superhero flies 287 meters from the top of a tall building at an angle of 17 degrees below the horizontal. What is the vertical component of the superhero's displacement? Answer in units of meters. The horizontal is 274.459 meters and the vertical ..
An electric kettle of 7.0 ohm resistance containing 500cm3 of water at 10 degrees Celsius is connected to the110 V supply. If 10% of the electrical energy is wasted byimperfect insulation, calculate how long it takes to convert allthe water into s..
A NASA satellite has just observed an asteroid that is on a collision course with the Earth. With what speed will it hit the Earth's surface
A 6000-kg truck is accelerating at 0.5 m/s2 up a slope of 5 degrees. calculate the driving force needed for the truck to accelerate up the incline
a tank of compressed oxygen gas at a doctors office has a pressure of 105 times atmospheric pressure. if the volume of
An aluminum rod is 17.0 cm long at 20°C and has a mass of 350 g. what is the change in length of the rod
A model rocket blasts off and moves upward with anacceleration of 12m/s^2 until it reaches a height of 27m, at whichpoint its engine shuts off and it continues it flight in freefall. what is the max height attained by the rocket?
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