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A baseball is thrown from the roof of a building of height 20.6 with an initial velocity of magnitude 14.0 and directed at an angle of 53.3 above the horizontal
Question: What is the speed of the ball just before it strikes the ground? Use energy methods and ignore air resistance.
Initially, the translational rms speed of a molecule of an ideal gas is 460 m/s. The pressure and volume of this gas are kept constant, find the final translational rms speed of the molecules
A 47.7 kg girl is standing on a 127 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. What is her velocity relative to the ice surface
A 30.0 cm long string is fixed at both ends. If standing waves are formed, what is the wavelength of the fundamental mode
A grindstone of a radius 4 m is firstly spinning with a radius of 8 rad/s. The angular speed is then increased to 12 rad/s over next 4.0 seconds. Suppose that the angular acceleration is constant. What is the average angular speed of grindstone.
A 100-V rms, 60-Hz source is applied to a load impedance Z. The apparent power entering the load is a 140 VA at a power factor of 0.707 lagging. Calculate the complex power
A 300-g mass at the end of an ideal spring vibrates up and down in such a way that it is 2.0 cm above the tabletop at its lowest point and 16 cm above at its highest point. find the speed and acceleration of the mass when it is 12 cm above the tabl..
A box of mass 12 kg moving on horizontal table. A wrench applies a constant force of 45.0 N that makes 37 degrees above the horizontal. what force do you need to apply to maintain that limit
An 840 kg car needs to round a level curve with a radius of 23m.The driver wants to proceed at 56 kph. How much work does the friction force do on the car
You are walking toward a plane mirror at a speed of 3 m/s. How fast is your image moving relative to you
Someone at a fifth-floor window (20 m above the ground) hurls a ball downward at 40.0° at a speed of 14.0 m/s. How long does the ball take to reach the sidewalk
A conical pendulum is formed by attaching a 41.0 g mass to a 1.3 m string. The mass swings around a horizontal circle of radius 32.0 cm. What is the tension in the string
A 5.00-kW motor is used to pull a 20.0-kg crate up a 15.0°-incline of length 4.00 m. At what average velocity can the motor move the crate up the incline
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