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Problem: You are going to go across Mississippi river from East to West bank by rowing your kayak. You know you can row 3 m/s in still water. You discovered that river flows with a water speed of 2 m/h from North to South.
Part A: What direction you should aim at in order to go across the river in the shortest time?
So confused, please explain how you got the answers. Thank you.
suppose the gas in a hot air balloon has density 0.800 kgm3. what volume must the balloon exceed in order to lift a
Assume you measure the terminal voltage of a 3.17 Volt lithium cell having an internal resistance of 5.20 ohm by placing a 1.00-k voltmeter across its terminals. Determine the actual terminal voltage to the nearest 0.001 Volt
Two small plastic spheres are given positive electrical charges. When they are 15 cm apart, the repulsive force between them has magnitude of 0.220N. what is the charge on each sphere
an inverted cylindrical container is lowered slowly beneath the surface of a pool of water. air trapped in the
A horizontal rod 0.200 m long carries a current through a uniform horizontal magnetic field of magnitude 0.067 T that points perpendicular to the rod. what is the current flowing through the rod
A large spherical shell with a mass of 145 kg and radius of 1.5m isinitially spinning at a rate of 30.0 rpm. A maintenance workersprays a protective coating on it, which adds 5.00 kg to its totalmass.
A kicker punts a football from the very center of the field to the sideline 36 yards downfield. The magnitude of the net displacement of the ball is 46 yards. What is the direction of the net displacement of the ball
At the surface of the Earth, the Sun delivers an estimated 1.43 kW/m2 of energy. Suppose sunlight hits a 16.3 m by 33.3 m roof at an angle of 90.0°. Estimate the total power incident on the roof
Two point particles of charge Q1 = 48 µC and Q2 = 86 µC are found to have a potential energy of 41 J. What is the distance between the charges
Seat belts and air bags save lives by reducing the forces exerted on the driver, A 58kg person is in a head-on collision. The car's speed at impact is 13m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air ..
A student sits at rest on a piano stool that can rotate without friction. The moment of inertia of the student-stool system is 4.7 kg *m^2. Calculate the final kinetic energy of the system
a merry-go-round r=2m, initially at rest is given a constant tangential push that depends on time. F(t) =β(t) applied on the rim. β=10N/s, Calculate angular acceleration as a function of time
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