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A 63 kg student traveling in a car with a constant velocity has a kinetic energy of 1.15e4 J. What is the speedometer reading of the car in km/h?
A force acting on a body in empty space increases at a constant rate from zero. The body has a mass of 10 kg, and after 4 seconds the force is 50 N. What is the speed of the object at 4 seconds?
If the backpack begins to slide when the spring ( = 130 ) stretches by 2.40 , what is the coefficient of static friction between the backpack and the table?
Consider the base monosodium phosphate, Na (HO)2P( O)O . (a) Write the structure of the conjugate acid of this base. (b) Given that the pKa of this conjugate acid is 2.1, explain why an aqueous solu
Point charges of +1.00 X 10-9C, +1.00 X 10-9 C, and -2.00 X 10-9, are placed at the vertices of an equilateral triangle. Find the magnitude of the electric field at the center of the triangle, whic
With the suspension point fixed.The mass is pulled away a distance 20cm beyond the equilibrium position 0 and released. Find The differential equation and initial conditions describing the motion.
A spring with a spring constant of 32.0 N/cm has a block attached to one end and the other end is fixed. How much work does the spring do on the block if the spring is stretched from relaxed length
Explain the effect on the magnitude of U and D if the vaulter moves his leading hand closer to the centre of gravity of the pole while pole is still in equilibrium.
A steel wire strung between two supports is initially horizontal when there is no tension on it. When a 9.5 kg painting is hung on the wire, the wire makes a 25° angle to the horizontal, as show
The block oscillates in simple harmonic motion. If the spring constant is 95.0 N/m, determine the amplitude at which the block loses contact with the spring.
A baseball is thrown at an angle of 26? relative to the ground at a speed of 25 m/s. The ball is caught 50.2046 m from the thrower. The acceleration due to gravity is 9.81 m/s2 . How long is it in
A 240 g block is attached to a horizontal spring and executes simple harmonic motion with a period of 0.150 s. If the total energy of the system is 3.00 J. Find the force constant of the spring
A resistor R and a capacitor C are connected in series to a battery of terminal voltage V0. Which of the following equations relating the current I in the circuit and the charge Q on the capacitor
An equilibrium mixture of this reaction at a certain temperature was found to have [NH3]= 0.276M and [H2S]= 0.350M .What is the value of the equilibrium constant (Kc) at this temperature?
A 24.0 loudspeaker is suspended 1.80 below the ceiling by two 4.00 long cables that angle outward at equal angles. What is the tension on each of the cables?
The goose has a mass of 16.8lb (pounds) and is flying at 10.3miles/h (miles per hour). What is the kinetic energy of the goose in joules?
An interference pattern is observed on a screen which is a distance 4.60 m from the slits. What is the distance on the screen between the first-order bright fringe for each wavelength?
A 2.00 cm x 2.00 cm parallel-plate capacitor has a 2.20 mm spacing. The electric field strength inside the capacitor is 5.00×10^4 V/m. What is the potential difference across the capacitor? H
According to the following reaction, how many moles of carbon dioxide will be formed upon the complete reaction of 29.1 grams of carbon monoxide with excess water?
The coefficient of kinetic friction between a refrigerator (mass 91 kg) and the floor is 0.12, and the coefficient of static friction is 0.26. If you apply the minimum force needed to get the refrig
What is the pressure in a 10.0-L cylinder filled with 0.485 mol of nitrogen gas at a temperature of 328 K
The athlete shown in the figure rotates a 1.00 kg discus along a circular path of radius 1.04 m. The maximum speed of the discus is 20.0 m/s. Determine the magnitude of the maximum radial accelerat
how much force must the biceps exert to hold a 1000 ball at the end of the forearm at distance = 31.0 from the elbow, with the forearm parallel to the floor? How much force must the elbow exert? Wha
The lights dim somewhat. If the internal resistance of the battery is 53 mΩ and that of the ammeter is negligible, what is the emf of the battery?
What is the silver ion concentration in a solution prepared by mixing 467 mL of 0.400 M silver nitrate with 421 mL of 0.503 M sodium phosphate? The Ksp of silver phosphate is 2.8 × 10-18