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A hot-air balloon is accelerating upward under the influence of two forces, its weight and the buoyant force. For simplicity, consider the weight to be only that of the hot air within the balloon, thus ignoring the balloon fabric and the basket. The hot air inside the balloon has a density of ?hot air = 0.93 kg/m3, and the density of the cool air outside is ?cool air = 1.29 kg/m3. What is the acceleration of the rising balloon?
A horizontal force of magnitude 100 N begins to pull directly on block. In unit-vector notation, what are the resulting accelerations of (a) block and (b) slab.
What is error in the simple pendulum approximation
A horizontal spring-mass system oscillates on a frictionless table. If the mass is 3.8 kg, the spring constant is 100 N/m, find the maximum extension of the spring
A box stands against the wall of a cylinder that is rotating. The cylinder has a radius of 30cm. What is the minimum consant speed (magnitude of linear velocity) the box must move so it doesn't slip
What is torque exerted by the fish about an axis
An air-filled parallel plate capacitor with a plate spacing of 1.50 cm has a capacitance of 7.20 ?F. Calculate the dielectric constant of the inserted material
Suppose you need to rotate the plane of polarization of a plane-polarized beam of light by 90 degrees and produce only a 10% loss in intensity, Find the angle between the successive polarizers
A 3.2-kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling. What is the elastic potential energy of the system
Suppose that you are traveling on board a spacecraft that is moving with respect to the earth at a speed of 0.970c. compute your breathing rate
A man enters a tall tower, needing to know its height. He notes that a long pendulum extends from the ceiling almost to the floor, How tall is the tower
Throughout a hard sneeze, your eyes may shut for 0.41 s. If you are driving a car at 98 km/h during such a sneeze, how far does the car move during that time.
The springs of a 1500 kg car compress 5.0 mm when its 68 kg driver gets into the driver's seat. what will be the frequency of vibrations
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