Search
Superman throws a 2400-N boulder at an adversary. What
horizontal force must Superman apply to the boulder to give it a
horizontal acceleration of 12.0 m/s2?
A box rests on a frozen pond, which serves as a frictionless horizontal surface. If a fisherman applies a horizontal force with magnitude 48.0 N to the box and produces an acceleration of magnitude 3.00 m/s2, what is the mass of the box?
Two dogs pull horizontally on ropes attached to a post; the angle between the ropes is 60.0°. If dog A exerts a force of 270 N and dog B exerts a force of 300 N, find the magnitude of the resultant force and the angle it makes with dog A’s rope.
A 68.5-kg skater moving initially at 2.40 m/s on rough horizontal ice comes to rest uniformly in 3.52 s due to friction from the ice. What force does friction exert on the skater?
A car lift in a service station is used to lift a car of mass 2200 kilograms. If the radius of the output piston is 8 centimeters and the radius of the input piston is 3 centimeters, find the force needed to be supplied to the input piston in order to lift the car
What are the quantum numbers for the electrons in the lithium atom (Z =
3) when the atom is in its ground state?
and do the Same question as 5 for Sodium (Z = 11).
Ceres is considered to be the largest asteroid in the asteroid belt between the orbit of mars and jupiter . Ceres diameter is approximately 945 km, and it's mass 8.96 x 10²⁰ kg. Find the acceleration due to gravity and the asteroid's escape speed
An electron beam in an X-ray tube is accelerated through 40kV and is incident on a tungsten target. What is the shortest wavelength emitted by the tube?
How many photons per second are emitted by a 7.50𝑚𝑊 𝐶𝑂2 laser that has a wavelength of 10.6𝜇𝑚?
On 20 July 1969, the astronauts of Apollo 11 placed a reflector on the surface of the moon that with the telescope and electronic equipment on earth allows measurements of the time of flight of laser pulses from earth to the moon and back. Scientists are able to measure the time of flight of laser pulse from earth to the moon and back with an accuracy of one nanosecond. What is the accuracy of the distance to the moon distance?
