Question

true or false questions

1. A body *can have mass*, but experience *zero weight
force*.

2. The force due to air resistance *always*
*opposes* the direction of motion.

Answer #1

1. True

Because the weight force of body depends upon the acceleration due to gravity (g). When a body having mass move with an elevator, the body behave as free fall and the weight of body in weighting machine shows zero. Hence weght force of body can be zero.

2. True

The air resistance force often opposes the direction of motion. When an object free fall its speed gets slow down due to air resistance force. The air resistance depends upon two factors such as speed of objects and surface area of the object.

true or false questions:
1. If a normal force is acting on a body, the normal force
will never be in the direction that the body is
moving.
2. A body can experience a weight force and have no
mass.
3. During a one-hour trip, a small boat travels 80.0 km north
and then travels 60.0 km east. The average velocity of the boat was
100 km/h.
4. A body undergoing projectile motion will always have
a constant acceleration.

During a one-hour trip, a small boat travels 80.0 km
north and then travels 60.0 km east. The average velocity of the
boat was 100 km/h.
True or false
If a body is moving in uniform motion, then there are no
external forces acting on the body.
True or false
The force due to air resistance always opposes the
direction of motion.
True or false

The Normal force always opposes the Weight force.
A.)True
B.)False
If a ball on a string is being spun around in a circle that is
perpendicular to the ground, at what point of the ball’s motion is
it being pulled on by the rope the hardest?
A.)At the bottom
B.)At the top
C.)45 degrees from top
D.)90 degrees from top

Are the following true or false? Please explain why.
1. an object undergoing projectile motion always has kinetic
energy.
2. A static friction force always oppose the direction of motion
of the body that it acts on.
3. When a body is moving in uniform circular motion, it has a
constant kinetic energy.
4. Energy is neither created, nor destroyed, it is only
transformed; unless a non-conservative force acts on the body.
5. A body with mass always experiences a...

true or false:
1-The direction of kinetic friction force is opposite to the motion
of the particle.
2-The vertical force on the displacement of the body
does not work.
3-The direction of kinetic friction force is in the
direction of the particle's motion.
4-Flexibility is the resistance of solid objects to
change in shape or size when exposed to stress.
5-Ying's modulus of a substance depends on the type of
material only and works in the linear region.

1. Motion of an object depends on its velocity only.
True
False
2. A car with a mass of 2500 kg is traveling at a speed of 30 m/s
due east. Choose the most appropriate answer to its momentum.
a. 30 m/s due east
b. 30 m/s
c. 75,000 kgm/s
d. 75,000 kgm/s due east
3. A car is traveling at 70 mph and then is involved in an accident
with a head-on collision into a very solid wall. As...

Question 1: Mark True or False beside each
statement below:
_______(a) The center of mass (gravity) of any object must lie
on a point within or on the body of each
object.
_______(b) The torque due to a force is independent of
the choice of axis of rotation.
_______(c) If the forces on an object balance, then this object
cannot experience any rotation.
_______(d) If the torques on an object balance, then this object
cannot have angular acceleration.
_______(e) If...

1) True or false? : The driving force for unsteady state
diffusion is a constant mass concentration gradient.
2) True of false? Carbon diffuses faster in Cu than in iron.

Find the air resistance acting on a parachuter that jumps from a
plane. The mass of the parachuter is 85 kg, the coefficient of
shape is 0.88 kg/m^3, and the velocity is 25 m/s. The area facing
the direction of the motion is 0.30m^2.
Compare the magnitudes of the air resistance and the weight of
the parachuter. What is the magnitude and direction of the net
force?

1.) Why do some objects fall faster than others near the surface
of the earth if all mass is attracted equally by the force of
gravity?
A. Some objects fall faster because of air resistance, which
acts in the direction of the motion of the object and exerts more
force on objects with less surface area.
B. Some objects fall faster because of air resistance, which
acts in the direction opposite the motion of the object and exerts
more force...

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