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Q. On a spacecraft two engines fire for a time of 585s. One gives the craft an acceleration in the x direction of ax = 5.1m/s2, whilst the other produces an acceleration in the y direction of ay = 7.3m/s2. At the end of the firing period, craft has velocity components of vx = 3810 m/s and vy = 4406 m/s. Find out the magnitude and direction of the initial velocity. State the direction as an angle with respect to the +x axis.
Using a diesel fired boiler with an efficiency of 80%.How many liters of diesel is required to create 1000kg of steam at 120degrees Celsius from make up water at 20 degrees Celsius.given that enthalpy of steam at 120 degrees Celsius is 2706.3kJ/kg..
A cosmic-ray proton in interstellar space has an energy of 10 MeV and executes a circular orbit having a radius equal to that of Mercury's orbit around Sun (5.80 × 1010 m). What is the magnetic field in that region of space.
David is driving a steady 21 m/s when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.20 m/s^2 at the instant as David passes.
A 16 kg wood ball hangs from a 2 m-long wire. The maximum tension the wire can withstand without breaking is 435 N. A 1.2 kg projectile traveling horizontally hits and embeds itself in the wood ball. What is the largest speed the projectile can ha..
A rope applies a horizontal force of 180N to pull a crate a distance of 2m across the floor A frictional force of 60N opposes this motion.
A uniform plank of length 2m and mass 29kg is supported by three ropes, as indicated by the blue vectors. Find the tension in each rope when a 690N person is 0.500m from the left end.
The atomic number of lead is 82. The alpha particle is a helium nucleus, with atomic number 2.
A helicopter is ascending vertically with the speed of 5.79. At a height of 127 above the Earth, a package is dropped from a window. How long take the package to hit the ground.
Two identical positive charges exert a repulsive force of 6.4* 10^-9 N when separated by a distance of 3.8*10^-10 m. find the charge of each.
A shopper pushes a cart 39 m south down one aisle and then turns 90.0° west and moves 22 m. He then makes another 90.0° turn and moves 14 m.
After the collision, the 2.00-kg object has a velocity 5.00 m/s to the west. How much kinetic energy was lost throughout the collision.
A uniform metal rod, with a mass of 3.3 and a length of 1.4 , is attached to a wall by a hinge at its base. A horizontal wire bolted to the wall 0.59 above base of the rod holds the rod at an angle of 25 above the horizontal. The wire is attached ..
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