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A car travels along a road at an average speed of 40km/h andreturns along the same road at an average speed of 60km/h. Calculate the average speed for the round trip.
Two disks of identical mass but different radii (r and 2r) are spinning on frictionless bearings at the same angular speed ?0, but in opposite directions. The two disks are brought slowly together. The resulting frictional force between the surfac..
A spherical weather balloon is filled with hydrogen until its radius is 3.40 m, Find the buoyant force acting on the balloon, assuming the density of air is 1.29 kg/m3.
A space vehicle is traveling at 4200 km/h relative to the Earth when the exhausted rocket motor is disengaged, What is the speed (km/h) of the command module relative to Earth after the separation
This question requires three answers. Three resistors are connected in parallel with a 9.0 V battery. What is the voltage drop across R2
an object can be hung from a string with a linear mass density of 0.00200 kg/m that passes over a light pulley. What is the frequency of the vibrator
An asteroid is discovered heading straight toward Earth at 14 km/s . An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10minutes , after which the asteroid is moving at 28degrees to its original pa..
What is the difference between momentum by convective transport and momentum by molecular transport?
laser eye surgery is carried out by delivering highly intense bursts of energy using electromagnetic waves. a typical
A f = 5 cm thin lens is to the left of a concave spherical mirror with a radius of curvature of magnitude 8 cm. The lens and the mirror are 20 cm apart, and an object is placed 8 cm to the left of the lens. Determine the position, orientation, and ma..
a charge of -2.205muc is located at 3.055m 4.501m and a charge of 1.800 muc is located at -2.533m 0.a find the electric
A gas is compressed from 655 cm3 to 171 cm3 at a constant pressure of 397 kPa. What is the change in thermal energy of the gas during this process
You are designing a machine for a space exploration vehicle. It contains an enclosed column of oil that is 1.05m tall, What must be the density of the oil
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