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The man and the daughter then carefully trade places. We will neglect any resistive forces between the boat and the water.
A 2 kg softball is pitched to you at 20 m/s. you hit the ball back along the same path and at the same speed. if the bat was in contact with the ball for .1 seconds, what is the magnitude of the ave
A 0.200-kg piece of aluminum that has a temperature of -163 °C is added to 1.1 kg of water that has a temperature of 1.8 °C. At equilibrium the temperature is 0 °C. Ignoring the containe
Question: Spring stretches by 0.0186 m when a 3.24-kg object is suspended from its end. How much mass should be attached to this spring so that its frequency of vibration is f = 5.53 Hz?
If 61.5 L of oxygen at 18C and an absolute pressure of 2.45 atm are compressed to 48.8L and at the same time the temperature is raised to 56 degrees C, what will the new pressure be?
If all the oxygen as is removed from the mixture by reaction with phosphorus, which does not react directly with nitrogen, then the new pressure is 251 torr. Calculate (a) the partial pressure of ni
A 65 kg man in a 5.9 kg chair tilts back so that all his weight is balanced on two legs of the chair. Assume that each leg makes contact with the floor over a circular area of radius 0.9 cm. Find th
An electric-generator turbine spins at 3800 rpm. Friction is so small that it takes the turbine 23.0 min to coast to a stop. How many revolutions does it make while stopping?
A 70-kg astronaut is space-walking outside the space capsule and is stationary when the tether line breaks. As a means of returning to the capsule he throws his 2.0-kg space hammer at a speed of 14
Consider two masses m1 and m2 at the top of two frictionless inclined planes. Both masses start from rest at the same height.
The coefficient of static and kinetic frictions between a 3 kg box and a desk are .4 and .3 respectively. What is the net force on the box when a 10 N horizontal force is applied to the box?
What are the components of the gravitational force along the axes normal and tangential to the inclined ramp? Draw the force vector diagram, labeling all your angles and forces.
The 500[m] Short Track speed skating Olympic world record is 39:937[sec] held by American JR Celski. Calculate JR's average speed in [miles=hr] during his record- setting performance.
Assuming the train can accelerate to its fastest speed in 5[s], determine the average acceleration in [m=s2] and g's Research how many g's the human body can experience prior to passing out, and det
The tube contains mercury with a density of 13600 kg/m3. Calculate both absolute and relative pressure on the bottom of the tank if the meniscus (mercury surface) of the leg opening in the open air
When a charged particle moves at an angle of 20° with respect to a magnetic field, it experiences a magnetic force of magnitude F. At what angle (less than 90°) with respect to this field wi
What must be the radius of a circular loop of wire so the magnetic field at its center is 1.40 10-4 T when the loop carries a current of 17 A?
A square coil of wire containing a single turn is placed in a uniform 0.30 T magnetic field, as the drawing shows. Each side has a length of 0.38 m, and the current in the coil is 12 A. Determine th
Two capacitors are connected in parallel across the terminals of a battery. One has a capacitance of 2.0 µF and the other a capacitance of 4.0 µF. These two capacitors together store 4.5
A double slit is illuminated with monochromatic light of wavelength 500nm. The m=1 bright fringe is located 2.0 cm from the centerline. The interference pattern is observed on a screen located 4.0
A 25g bullet pierces a sand bag 27cm thick. If the initial bullet velocity was 64 m/s and it emerged from the sandbag with 35m/s, what is the magnitude of the friction force (assuming it to be const
The work done by an electric force in moving a charge from point A to point B is 2.52 10-3 J. The electric potential difference between the two points is VA ? VB = 42.0 V. What is the charge?
What formula do I use to find electric potential? Units? What formula do I use to find potential energy? Units? If you can give an example with three point charges on an equilateral triangle that wo
The first place is 4.00 cm to the left of the negative charge. The second place is 7.00 cm to the right of the negative charge. What is the distance between the charges?
A hockey puck has a mass of 0.116 kg and is at rest. A hockey player makes a shot, exerting a constant force of 27.5 N on the puck for 0.16 s. With what speed does it head toward the goal?