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A roofer is working on a roof that slants at 39.0° above the horizontal, he accidentally nudges his 89.0N toolbox, causing it to start sliding downward, starting from rest.If it starts 4.05m from the lower edge of the roof, how fast will the toolbox be moving just as it reaches the edge of the roof if the kinetic friction force on it is 17.0N ?
A curve with a 140 radius on a level road is banked at the correct angle for a speed of 20 . If an automobile rounds this curve at 30 , what is the minimum coefficient of static friction between tires and road needed to prevent skidding.
One day the brakes fail just as the cable car leaves the top on its downward journey. What is the runaway car's speed at the bottom of the hill
What must be the mass m2 of the hanging block if it is to descend 11.0m in the first 3.00s after the system is released from rest
The primary coil of a transformer has N1= 300 turns, and the secondary coil has N2= 1810 turns. find rms voltage is developed across the secondary coil?
How long must a 0.60-mm-diameter aluminumwire be to have a 0.50 A current when connected to the terminals ofa 1.5 V flashlight battery
A 79.2 kg airplane pilot pulls out of a dive by following, at a constant speed of 191 km/h, the arc of a circle whose radius is 321m.
Potassium iodide has an interplanar spacing of d = 0.296 nm. A monochromatic X-ray beam shows first-order diffraction maximum while the grazing angle is 7.8°. Compute the X-ray wavelength λ .
On a spacecraft, two engines fire for a time of 598 s. One gives the craft an acceleration in the x direction of ax = 4.92 m/s^2, while the other produces an acceleration in the y direction of ay = 7.60 m/s2. At the end of the firing period, the c..
A 2.9-kg box is sliding along a frictionless horizontal surface with a speed of 1.8 m/s when it encounters a spring. Determine the initial speed the box would need in order to compress the spring by 1.2 cm
A textbook of mass 2.08kg rests on a frictionless, horizontal surface. What is the tension in the part of the cord attached to the textbook
A 80.0 Hz generator with an rms voltage of 150 V is connected in series to a 3.20 k ohm resistor and a 3.50 micro farad capacitor. Find the phase angle between the current and the voltage
A train at rest emits a sound at a frequency of 1045 Hz. An observer in a car travels away from the sound source at a speed of 37 m/s.What is the frequency heard by the observer . What must be the result have been for the horizontal speed.
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