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1. A heat engine takes in 1000 J of energy at 1000 K and exhausts 615 J at 200 K. What are the actual and maximum theoretical efficiencies of this heat engine?
2. If a mass on a spring takes 14 s to complete five cycles, what is its period?
3. A mass on a spring bobs up and down over a distance of 29 cm from the top to the bottom of its path four times each second. What are its period and amplitude?
4. A girl with a mass of 40 kg is swinging from a rope with a length of 2.8 m. What is the frequency of her swinging?
5. A periodic wave on a string has a wavelength of 24 cm and a frequency of 2.0 Hz. What is the speed of the wave?
6. What is the distance between adjacent crests of ocean waves that have a frequency of 0.18 Hz if the waves have a speed of 2.6 m/s?
A constant electric field directed upon the positive x axis has a strength of 2000 N/. find the force exerted on the proton by the field
A copper block is removed from a 300^0 C oven and dropped into 1 L of water at 20.0^0 C. The water quickly reaches 25.5^0 C and after that remains at that temperature. What is the mass of copper block.
three capacitor , with capacitance of c1=4.0mf,c2=3.0mf ,c3=2.0mf , are connected to a 24v source (c1 is in series with c2 but c2 and c3 are in parallel, what is the equivalent capacitance of the three capacitors
Two tugboats pull a disabled supertanker. Each tug exerts a constant forace of 1.55*10^6n, What is the toal work they do on the supertanker
The electric motor of a model train accelerates the train from rest to 0.580 m/s in 33.0 ms. the total mass of the train is 563 g. Find out the average power delivered to the train during its acceleration. The units need to W for the final answer.
A boat takes 2.6 hrs. to travel 50 km down a river, then 5.6hrs to return. How fast is the river flowing
You have a compound microscope with a barrel of length 161 mm. Find the total angular magnification of the microscope for a person whose near point is 25.0 cm away
A gasoline engine absorbs 4190 J of heat and performs 3170 J of mechanical work for each turn of the engine shaft
A simple pendulum has a length L and a mass m. At its highest point, the pendulum mass is 0.25L above its lowest point. What is the speed of mass when it is at its lowest point
Use Gauss law to compute amount of charge
A child on a sled starts from rest at the top of a 15.0 degree slope. If the trip to the bottom takes 15.2s, how long is the slope
An aircraft weighing 902 N is accelerated at 10.8 m/s/s for 5 seconds, at which time the aircraft launches. What is the force required to launch the aircraft
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