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When a car is traveling at 25 m/s on level ground, the stoppingdistance is found to be 22m. This distance is measured by pushinghard on the brakes so that the wheels skid on the pavement. The same car is driving at the same speed down an incline that makes anangle of 8 degrees with the horizontal. What is the stopping distance now, as measured along the incline?
An astronaut at rest on Earth has a heartbeat rate of 70 beats/min. What will this rate be when she is traveling in a spaceship at 0.90c as measured (a) by an observer also in the ship and (b) by an observer at rest on the Earth?
Gas is contained in a 6.00-L vessel at a temperature of 21.0°C and a pressure of 8.00 atm. Determine the number of moles of gas in the vessel
A converging lens (f1 = 24.0 cm) is located 56.0 cm to the left of a diverging lens (f2 = -28.0 cm). How far is the object from the converging lens
The linear coefficient of thermal expansion for concrete is 12x10^-6 ºC^-1. Consider a slab of concrete which is 4.0 m long at 0.0 ºC. What seems to be the primary safety concern in the lab
The vibrational energy levels of an HBr molecule are EK = C (K + ½), where C = 5 · 10–20 Joules and K = 0, 1, 2,… Each level is singly degenerate: gK = 1. Consider four HBr molecules trapped in a solid matrix such that they are able to undergo vib..
A 20.0- projectile is fired at an angle of 60.0 above horizontal with a speed of 80. At the highest point of its trajectory, projectile explodes into two fragments with equal mass, one of which falls vertically with zero initial speed. You can ign..
The change in specific enthalpy during the melting of ice at 0 degrees C and 1.01 X 10^5 Pa is ?h= 333.39 kj/kg. find the change in entropy of reservoir and universe
An object experiences a constant acceleration of 2.0 m/s^2 along the -x axis for 2.7s, Find the initial velocity vector of the object
In the Atwood machine shown below, m1 = 2.00 kg and m2 = 5.50 kg, How far will m1 descend below its initial level and Find the velocity of m1 after 1.80 s
A soccer ball is kicked with an initial horizontal velocity of 18 m/s and an initial vertical velocity of 13 m/s, What is the initial speed of the ball, What is the initial angle of the ball with respect to the ground
Water is lifted out of a well 22.0m deep by a motor rated at 1.40hp .Assuming efficiency 90% , how many kilograms of water can be lifted in 1 min
Water moves into a pipe of cross sectional area 0.5m2 at a rate of10m/s. at a pressure of 10,000kPa. Determine the mass rate of flow of the water. The duct necks down to a cross-sectional area of 0.2m2. Determine the velocity in this cross-section.
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