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A motorboat heads due east at 12.0 m/s across a river that flows toward the south at a speed of 4.1 m/s. What is the angle from the original heading (with counterclockwise positive) of the boat's di
What is the horizontal component of the superhero's displacement? Draw the vectors to scale on a graph to determine the answer.
What is the electric potential energy of an electron at the negative end of the cable, relative to the positive end of the cable?
A chair of weight 135 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 45.0 N directed at an angle of 42.0^circ below the horizontal and the
A 48.0 kg mass attached to a spring oscillates with an amplitude of 2.20 m. The total mechanical energy of the system is 380 J. Find the position of the mass when its speed is 2.00 m/s. newtons
Verify that electrode A is positive as shown. Does the sign of the emf depend on whether the mobile ions in the blood are predominantly positively or negatively charged? Explain.
A 28g rifle bullet traveling 290m/s buries itself in a 3.9kg pendulum hanging on a 3.0 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal componen
A wheel moves forward for 2.0 seconds making two complete revolutions. The wheel rotates through an arc length of 8.2 meters. Find the radius of the wheel
The block slides 3.27 m from the point of release to the point where it comes to rest against the spring. When the block comes to rest, how far has the spring been compressed?
Heather throws a rock straight down with a speed of 19 m/s. Jerry, at exactly the same instant of time, throws a rock straight up with the same speed. Ignore air resistance. How much time elapses be
A laser emits a single, 3.0-ms pulse of light that has a frequency of 2.83 × 1011 Hz and a total power of 65 000 W. How many photons are in the pulse?
If the tension in each chain at the lowest point is 350 N, find a) the child's speed at the lowest point and b) the force exerted by the seat on the child at the lowest point.
A dog pulls on a pillow with a force of 2.4 N at an angle of 20.1? above the horizontal a) What is the x component of this force?
Water flows through a horizontal tube of diameter 3.0 that is joined to a second horizontal tube of diameter 1.9 . The pressure difference between the tubes is 7.6. Find the speed of flow in the fir
A 7400 boxcar traveling at 16.0 strikes a second boxcar at rest. The two stick together and move off with a speed of 6.0 . What is the mass of the second car?
Gas contained in an 8.0L vessel at a temperature of 20 degrees celsius and a pressure of 9.0 atm. Determine the number of moles of gas in the vessel? and how many molecules are in the vessel?
1. A 1500kg car is traveling along a straight road at 20m/s. Two seconds later, it's speed is 21m/s. What is the magnitude of the net force acting on the car during this time? 2. What are the force
People use energy at a rate of about 1.5 x 1013 W. Assuming that these numbers are correct, what percentage of the Sun's energy would supply our energy needs?
Neglecting air resistance, calculate the velocity of the ball after 2.97 s. The acceleration of gravity is 9.8 m/s2 .
An 82-kg water skier floating in a lake is pulled from rest to a speed of 12 m/s in a distance of 25 m. What is the net force exerted on the skier, assuming his acceleration is constant?
1. A 1500kg car is traveling along a straight road at 20m/s. Two seconds later, it's speed is 21m/s. What is the magnitude of the net force acting on the car during this time? 2. What are the forces
A rotating cylinder about 16 {rm km} long and 8.0 km in diameter is designed to be used as a space colony. With what angular speed must it rotate so that the residents on it will experience the sam
We want to launch the package in such a way that it will never come back, and when it is very far from the asteroid it will be traveling with speed 187 m/s. We have a large and powerful spring whose
What is the maximum mass of lead you could melt with 1000;{rm J} of heat, starting from 20^circ rm C?
Find the average magnitude of the induced emf if the change in shape occurs in 4.07 s, and the local 0.108 T magnetic field is perpendicular to the plane of the loop.