An
object is at rest on the ground. The object experiences a downward
gravitational force from Earth. Which of the following predictions
is correct about why the object does not accelerate downward?
Select two answers. Justify your selections.A) The bonded molecules of the object are repelled upward by
the bonded molecules of the ground with the same magnitude as the
gravitational force downward on the object.B)The normal force is exerted upward on the object from the
ground with the same...
Besides the gravitational force, a 2.50-kg object is subjected
to one other constant force. The object starts from rest and in
1.20 s experiences a displacement of (5.40î − 3.30ĵ) m, where the
direction of ĵ is the upward vertical direction. Determine the
other force.
The gravitational force exerted on a solid object is 5.70 N.
When the object is suspended from a spring scale and submerged in
water, the scale reads 2.10 N (figure). Find the density of the
object.
5a) The gravitational force on a particle of mass m inside the
earth at a distance r from the center (r < RE the radius of the
Earth) is F = −mgr/R. Show that in an evacuated, frictionless tube,
the particle would move back and forth through the tube with a
simple harmonic motion and find the period of that motion.
A force F1with magnitude 10 acts in the direction of θ1= 30◦ and
another force F2 with magnitude 14 acts in a direction of θ2= 280◦.
Find the magnitude and the direction of the resultant force
F1+F2.
1)An object experiences a force in the direction opposite its
motion. This means
the work vector points in the negative direction
the scalar value of work is negative
the scalar vector of work could be either positive or negative,
depending on which direction is chosen to be positive.
the work vector could point in either the positive or negative
direction, depending on which direction is chosen to be
positive.
2: A hand lifts a block vertically upward at constant
velocity....
A
force acts at the origin in a direction defined by the
angles uy
5
65°
and uz
5
40°.
Knowing that the x
component of the
force is 2750
N, determine (a)
the other components and the magnitude of the force,
(b)
the value of ux
Find the magnitude and the direction of the resultant force that
acts upon the elbow which is located on the horizontal plane.
Diameter of pipe at section (1) is D1=10 cm, pressure is P1=150000
Pa , the diameter at section (2) is D2= 5 cm and the discharge is
Q=0.025 m3/s.(pwater= 1000 kg/m3) Use Formula: ∑f equal to
pQv2-pQv1
A tank of water is emptied by the force of gravity
through a syphon. The difference in water levels between the two
tanks is 3 m and the highest point of the syphon is 2 m above the
top surface level and the length of the pipe from inlet to the
highest point is 2.5 m. The pipe is designed with a bore of 25 mm
and the length 6 m. The pipe frictional coefficient is 0.007 and
the inlet...
4)
Earth exerts a gravitational force of more than 1,000,000 N on an
international space station what force does the ISS expert on
earth?
20) you hace no doubt seen pictures or the astronauts floating
around inside a space shuttle as it orbits some 300 kilometers
above earths surface. would the force of gravity earth exerts on an
astronaur be rhe same as a little less rhan or much less than the
force that the astronaut would experience on earth?...