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A hot-air balloon of mass 300 kg is descending vertically with downward acceleration of magnitude 1.1 m/s2. How much mass (ballast) must be thrown out to give the balloon an upward acceleration of
Suppose that you ecert 400 N horizontally on a 50-kg crate on a factory floor, when friction between the crate and the floor is 200 N. What is the acceleration of the crate?
The electric flux through each of the six sides of a closed rectangular box are as follows:
When the batter hits the ball, a net force of 1320 N, opposite to the direction of the ball's initial motion, acts on the ball for 9.0 x 10^-3 during the hit. what is the change in momentum of the b
Haplopappus gracilis is a diploid plant with only two pairs of chromosomes.
A ball is held on an incline at the height of 75cm. it is then released so that the ball rolls down the incline. at the bottom of the incline there is a loop where the ball rolls around in. If the
Fred and Barney are two electric charges that are initially held 1 meter apart and experience an electric repulsion of 10 pounds of force. What would be the force of repulsion between them be if th
A highway curve of radius 500 m is designed for traffic moving at a speed of 73.0 km/hr. What is the correct banking angle of the road?
Identify 3 important reasons why cells use energy
The magnitude of vector is 34.1 units and points in the direction 344° counterclockwise from the positive x-axis. Calculate the x-component of this vector.
A speed skater moving across frictionless ice at 8.1m/s hits a 5.6m wide patch of rough ice. she slows steadily, the continues on at 6.5m/s. what is her acceleration on the rough ice
In a cross between a purple flowered plant and a white flowered plant, all 73 of the offspring had purple flowers. What are the most likely genotypes of the parent plants
A manager of a restaurant pushes horizontally with a force of magnitude 150 N on a box of melons. The box moves across the floor with a constant acceleration in the same direction as the applied fo
Most biologists believe that the immune system's defense against infections largely rests on its ability to distinguish self molecules from non-self molecules.
When you weigh yourself on solid ground, your weight is 141 lb. In an elevator your apparent weight is 122 lb. What are the direction and magnitude of the elevator's acceleration?
Thermal energy can shift some of the electrons in a hot semiconductor from valence levels to conduction levels. What effect do these shifts have on the semiconductor's ability to conduct electricity
A 13 g bullet traveling 227 m/s penetrates a 2.0 kg block of wood and emerges cleanly at 167 m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after the bull
A certain species of fungus is only foind living on cow patties. what type of dispersion pattern is the fungus exhibiting?
Calculate the horizontal distance the ball would travel if the same spring were aimed 39.0o from the horizontal.
A 70 driver gets into an empty taptap to start the day's work. The springs compress 1.8×10-2 . What is the effective spring constant of the spring system in the taptap?
For a spring-mass oscillator, if you double the mass but keep the stiffness the same, by what numerical factor does the period change? That is, if the original period was T and the new period is bT
Describe 3 ways in which the plant cell and the solar cell are similar to each other as well as 3 ways in which they are different
A 0.114 kg meterstick is supported at its 36.6 cm mark by a string attached to the ceiling. A 0.649 kg mass hangs vertically from the 4.67 cm mark.
1) Describe your local and surrounding ecologies and environments 2) List the specific factors that distinguish your local ecology and environment.
Describe the difference between white and gray matter in the brain as well as the spinal cord. How does this distribution compare in each of the brain areas, like the cerebrum, the cerebellum, and the