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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 .
the normal pH in a human stomach is between 1.5 and 3.5, the Medical Examiner examined the stomach and found the hydrogen ion [H+] concentration to be 10-12 moles/liter (0.0000000000010 moles/liter.
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.
Oversize wheels give too low a reading, because they really travel farther per revolution than the speedometer indicates; and undersize wheels give too high a reading because the wheels do not go as
Find the magnitude of the electric field. Use 1.60×10-19 C for the magnitude of the charge on an electron and 1.67×10-27 kg for the mass of a proton. Find the speed of the proton at the mo
Water being diverted during a flood in Helsinki, Finland (latitude 60? N) flows along a diversion channel. On which side is the water highest (from the standpoint of a noninertial system) and by how m
A 25000 kg rocket ship accelerates upwards due to constant 1.25MH of thrust from its engin. A simple pendulum on the ship is observed to complete 100 full swings in 75 seconds. What is the length o
A 12.39 g sample of phosphorus reacts with 42.54 g of chlorine to form only phosphorus trichloride. if it is the only product, what mass of PCl3 is formed?
A submarine dives 110.0 m at an angle of 10.0° below the horizontal. What are the horizontal and vertical components of the submarine's displacement? (Assume that upward and the direction of th
A bucket of water is to be swung in a vertical circle without a drop of water being spilled. If the circle has a radius of 0.80m, what must be the minimum speed of the upside down bucket at the top
It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.200 s, what is the average force exerted by the wall on the ball?
In a game of tug of war, one person pulls with force of 100N to the left, and the other pulls with a force of 60N to the right. What is the net force and direction of the net force and acceleration
138g of potassium and 448g of iodine react completely to form iodine. if 138g of potassium and 41g of iodine has been used, what mass of KI would have been produced ?
A satellite has a mass of 6168 kg and is in a circular orbit 4.03 × 105 m above the surface of a planet. The period of the orbit is 2.1 hours. The radius of the planet is 4.50 × 106 m. W
A river flows due east at 1.56 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 10.9 m/s due north relative to the water.
The vibrating portion of the guitar string has a length of. What is the speed of transverse waves on the guitar string?
A uniformly charged disk of radius 35.0 cm carries charge with a density of 7.90 x 10-3 C/m2. Calculate the electric field on the x axis of the disk at (a) 1.00 cm, (b) 5.00 cm, (c) 30.0 cm, and (d
Assume that the spring has negligible mass and that all its stored energy is transferred to the particles. Once that transfer is complete, what are the kinetic energies of (a) particle A and (b) par