1. A worker pulls horizontally on a crate across a rough horizontal surface, causing it to move forward with constant velocity. Force A is the force exerted by the worker and force B is the force of friction due to the surface. What is the relationship between A and B?
A. A>B
B. A<B
C. A=B
2. A boy pushes a box with force of 150 N at a angle of 40° with a flat floor. What component of his force is directed downward, or into the floor?
A. 96.4 N
B. 114 N
C. 150 N
D. 40 N
3. Which type of force can act through empty space?
A. magnesium
B. spring
C. normal
D. tension s
4. Which of these objects has the greatest inertia?
A. aircraft carrier
B. airplane
C. bowling ball
D. pillow
Help please!!!
I don't know 1
2. 150cos(40)=144
B. 144N
3. Magnetism is the force of attraction or repulsion in magnetism. This is the only force that can act through empty space.
A. Magnetism
4. The inertia of an object is directly proportional to the objects mass.
A. Aircraft carrier
1. The relationship between force A and force B is A=B.
2. The component of force directed downward or into the floor can be calculated using the formula:
Force down = Force x sin(angle)
Plug in the values:
Force down = 150 N x sin(40°)
Force down = 150 N x 0.6428
Force down = 96.4 N
Therefore, the component of the force directed downward is 96.4 N.
3. The type of force that can act through empty space is tension.
4. The object with the greatest inertia is the aircraft carrier. Inertia is the resistance of an object to changes in its motion, and it depends on the mass of the object. Among the given options, the aircraft carrier has the highest mass and therefore the greatest inertia.
1. To determine the relationship between force A exerted by the worker and force B of friction, we can use Newton's first law of motion, which states that an object will remain at rest or in constant motion in a straight line unless acted upon by an external force. In this case, since the crate is moving forward with constant velocity, we know that the net force acting on it is zero, meaning that the force A exerted by the worker is equal in magnitude and opposite in direction to the force B of friction.
Therefore, the relationship between A and B is C. A = B.
2. The force applied by the boy can be split into two components: one directed horizontally and one directed vertically. The vertical component of the force is the force that is directed downward or into the floor.
To find this component, we can use trigonometry. The vertical component is equal to the force magnitude (150 N) multiplied by the sine of the angle (40°).
Vertical component = 150 N * sin(40°) ≈ 96.4 N
Therefore, the component of the force directed downward or into the floor is approximately 96.4 N.
The answer is A. 96.4 N.
3. The type of force that can act through empty space is not listed among the options given. However, the force that can act through empty space is the gravitational force. Gravity is an attractive force that acts between objects with mass, regardless of whether there is a physical medium between them.
Therefore, none of the options provided correctly answer the question.
4. Inertia refers to an object's resistance to changes in its motion. The greater an object's mass, the greater its inertia.
Among the given options, the one with the greatest mass is most likely to have the greatest inertia. In this case, the object with the greatest mass is an aircraft carrier, so the answer is A. aircraft carrier.
Please note that if more information or options were provided, the answer might differ.