Mechanics | Relativity Answers

A bus travel as 60km/hr.how long those it take cover a distance of 500km

1) You are the head engineer for a 3,000 kg rocket that is nearing the moon at a speed of 20,000 kilometers per hour (5,556 m/s). It needs to quickly slow to 10,000 kilometers per hour (2,778 m/s) to begin a controlled descent to the surface. If the rocket descends too fast it will crash and too slowly it will run out of fuel. The rocket has a new braking system consisting of several 6.00 kg metal spheres on the front of the rocket that can be fired straight ahead. Each has an explosive charge that fires it at a speed of 120,000 meters per second with respect to the rocket. You need to send the rocket’s computer system a message telling it how many spheres to fire. How many spheres would need to be fired for a safe landing?

What is maximum height in projectile motion.

What is newton second law

The force of friction between an object and the surface upon which it is sliding is 15N. The mass of the object is 20jg. What is the coefficient of kinetic friction?

Find enenrgy of photon whose wavelength is 3.8 x 10-7m

The curre Earth, called plate tectonics, tells us that the continents are in constant motion. Assume that the North American continent can be represented by a slab of rock 4700 km on a side and 28 km deep and that the rock has an average mass density of 2940 kg / (m ^ 3) The continent is moving at the rate of about 4.2 cm / y * e * a * r . What is the mass of continent ? Answer in units of kg
What is the kinetic energy of the continent
a jogger (75kg) has the same kinetic energy what would his speed be?

A car that is traveling down a highway has
1,30 x 10s J of kinetic energy. A truck with 8.30
times the mass of the car is traveling at the same
speed. What is the kinetic energy of the truck

A liquid with specific gravity of 1.2 fills a volume. If the mass in the volume is 146kg
, what is the magnitude of the volume?