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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?
Two cylindrical artificial bones are made of the same material and length, one with twice the radius as the other. When the two have the same tension force applied, the larger bone stretches by what factor compared to the smaller bone?
You observe that the hammer hangs at rest with respect to the bus when the angle between the rope and the ceiling of the bus is 79. Illustrate what is the acceleration of the bus?
The femur is a bone in the leg whose minimum cross-sectional area is about 4.3 x 10-4 m2. Find the maximum stress that this bone can withstand
q1. a cord passes over a weightless and frictionless pulley. masses of 220 g and 389 g are attached to the ends of the
A 2.5-cm-tall object is 24cm to the left of a lens with a focal length of 12cm, Calculate the distance between image and the second lens
A vector has an x-component of ?21.0units and a y-component of 50.0 units. Find the magnitude and direction of the vector
A 3.00*10^2-eV electron and a 1.00*10^2-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits?
A charge of -3.0 nC is at the origin and a second charge of 13.0 nC is at x = 8.00 m. Find the magnitude and direction of the electric field halfway in between the two charges.
An egg rolls off a kitchen counter and breaks as it hits the floor. How large is the impulse that the floor exers on the egg, and how large is the force exerted on the egg by the floor when stopping it? The counter is 1.0mhigh, the mass of the egg is..
A charge +q is located at the origin, while an identical charge is located on the x axis at x = +0.42 m. find Where should the third charge be located
a person whose weight is W = 658 N doing push-ups. Find the normal force exerted by the floor on each hand
Sean climbs a tower that is 84.7 m high to make a jump with a parachute. what is the potential energy of Sean
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