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The punter on a football team tries to kick a football so that it stays in the air for a long "hang time." If the ball is kicked with an initial velocity of 25.2 m/s at an angle of 59.5° above the ground, what is the "hang time?"
A 5.00 x 10^4 kg space probe is travelling at a speed of 14000 m/s through deep space. Retrorockets are fired along the line of motion to decrease the probe's speed. The retrorockets generate a force of 4.00 x 10^5 N over a distance of 2600 km. What ..
a helium nucleus has radius rhe 1.9 fm mass m 6.6 times 10-27 kg and charge 2e. a gold nucleus has charge 87e and
The threshold intensity for a human eye to sense the presence of light is 50 photons falling on the retina within a period of 0.1 s. Estimate how far away the star can be away
A baseball is hit at an angle of 60° above the horizontal with a speed of 40 m/s. There is a 15 m high fence located at 120 m from the batter. How high is the ball at its highest point
Most of us know intuitively that ina head-on collision between a large dump truck and a subcompactcar, you are better off being in the truck than in the car. What average force does the seatbelt exert on the car driver
The propeller of a light plane has a length of 1.752 m and a mass of 19.96 kg. The rotational energy of the propeller is 158.6 kJ. What is the frequency of the propeller in rpm
The second hand of a clock has a length of 0.30 m. Evaluate what distance does the tip of the second hand sweep through in 3 minutes and 45 seconds?
If the Young's Modulus of the material is made from is 310 MN/m^2 what is the effective spring constant of the cord for stresses and strains where Young's Modulus is valid
If the wet bulb temperature of a parcel at 1000mb is 60F and its mixing ratio is 6 g/kg, find the relative humidity of the parcel after it is lifted dry adiabatically to 900mb. Assume a constant latent heat of vaporization of 2.47 x 10^6 J/kg.
a 1 kg projectile is shot straight up from the earths surface with a velocity of 100 ms and reaches a height of 300 m
the current in a coil with a self-inductance of 1 mh is 3.0 a at t 0 when the coil is shorted through a resistor. the
an equilateral triangle has sides of 0.14 m. charges of -8.5 8.0 and 1.6 microc are located at the corners of the
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