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A student dissolved 3.00 g of Co(NO3)2 in enough water to make 100.00 mL of stock solution. He took 4.00 mL of the solution then diluted it with water to give 275 mL of a final solution. How many moles of NO3-1 are there in the final solution?
A 1,200 kg car going 25 m/s is brought to stop using its brakes. Let's assume that a total of approximately 20 kg of iron in the brakes, What was the car's original kinetic energy
The convex lens of a copy machine has a focal length of 25 cm. A letter to be copied is placed 40.0 cm from the lens.
A 4.4-g bullet leaves the muzzle of a rifle with a speed of 314 m/s. What force (assumed constant) is exerted on the bullet
When cars are equipped with flexible bumpers, they will bounce off each other during low-speed collisions, thus causing less damage. What was the speed of the lighter car just after the collision
Two identical capacitors ,each with capacitance C,are connected in series and the combination is connected in paralell to a third capacitor.the equivalent capacitance of this network is?
Consider the interference/ diffraction pattern from a three-slit arrangement as shown. Take d=3.5a. The wavelength of the monochromatic light incident upon the slits is ?=0.5a. The amplitude of the electromagnetic wave hitting the middle slits is ..
Calculate the average velocity
An investigator collects a sample of a radioactive isotope with an activity of 4.4×105Bq . 72hourslater, the activity is 1.2×105Bq. What is the half-life of the sample
A solid aluminum ingot weighs 71 N in air. What is its volume
The brake system on the San Francisco cable car uses a wedge pushed into the cable slot. what is the mechanical advantage of the wedge as a braking machine
Two dogs pull horizontally on ropes attached to a post; the angle between the ropes is 50.0 deg. Find the angle the resultant force makes with the rope of dog A
In a single slit diffraction pattern the intensity of the maxima
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