PHYSICS HIGH SCHOOL

The greater the mass is in an object, the higher resistance to a change in movement the object will have. Please select the best answer from the choices provideda. True
b. False

Answers

Answer 1
Answer: This statement is true. The greater the mass is in an object, it is indeed the higher resistance to a change in movement the object will have. That only mean that the mass of an object and its resistance to change of movement is directly proportional.

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Does It take 100 HP to lift a 1000 kg weight from ground to the 4th floor. True or False.

Answers

Answer:NOPE you need more

Explanation:

The power required to lift a weight depends on the force needed and the speed at which the weight is lifted. The force required to lift a weight is given by the equation F = m * g, where m is the mass of the object and g is the acceleration due to gravity (approximately 9.81 m/s² on Earth).

For example, if a 1000 kg weight is lifted 10 m in 10 seconds, the work done can be calculated as W = (1000 kg) * (9.81 m/s²) * (10 m) = 98100 J (Joules). The power required is work done per unit time P = (98100 J) / (10 s) = 9810 W (Watts), which is approximately 9.8 kW¹.

In terms of horsepower, since 1 horsepower is approximately equal to 746 Watts¹, the power required would be about 13.15 horsepower. So, it does not require 100 horsepower to lift a 1000 kg weight from the ground under these conditions. However, these calculations assume ideal conditions and do not take into account factors such as air resistance or mechanical inefficiencies. In real-world applications, more power might be needed.

Which of the following is an agent of socialization?a. a grandparent
c. TV
b. school
d. all of the above

Answers

Socialization is a way of interacting toother people and in return, gaining insights as well as part of learningprocess. Above choices are all agents of socialization so that is letter D: allof the above. A grandparent can teach you lessons of his experiences in lifesince he is older than you. Television is a medium to be able to know how tointeract with people by basing on it and learning with whatever is shown.School is an area where different people of different ages convene and learntogether. This give you the opportunity to learn from different personalitiesof ages and experiences.

Answer:

D

Explanation:

A horizontal 20.-newton force is applied to a 5.0-kilogram box to push it across a rough,horizontal floor at a constant velocity of 3.0 meters per second to the right.

Calculate the coefficient of kinetic friction between the box and the floor. [Show all work, including
the equation and substitution with units]

Answers

The formula to work out the coefficient of dynamic (kinetic) friction is F=uR where F is the force applied, u is the coefficient of dynamic friction, and R is the reaction force. This is based on the principle the object is moving at a constant velocity which is the case in this question.

Rearranging this we get u=F/R
Substituting in the values we get u=20/50=2/5=0.4

Therefore the coefficient of kinetic friction between the box and the floor is 0.4

The coefficient of kinetic friction between the box and the floor will be \boxed{0.4} .

Further Explanation:

Given:

The mass of the box is 5\,{\text{kg}} .

The force applied on the box is 20\,{\text{N}} .

The constant velocity at which the box moves is 3\,{{\text{m}}\mathord{\left/{\vphantom{{\text{m}}{\text{s}}}}\right.\kern-\nulldelimiterspace}{\text{s}}} .

Concept:

The box is pushed on the rough floor and due to this; the box will experience a friction force acting in the direction opposite to the motion of the box.

Since the box moves with a constant velocity of 3\,{{\text{m}}\mathord{\left/{\vphantom{{\text{m}}{\text{s}}}}\right.\kern-\nulldelimiterspace}{\text{s}}} , the acceleration of the box will be considered as zero.

From Newton’s second law of motion, as the acceleration of the box is zero, the net force acting on the box is zero.

\boxed{{F_(net)}=m* a}

The free-body diagram of the box moving on the rough floor is as shown in figure attached below.

From the above explanation, in order to make the net force zero, the friction acting on the box should be equal to the force applied on the box.

{F_(friction)}={F_(applied)}

The friction force acting on the bxlock is:

\begin{aligned}{F_(friction)}&=\mu N\n&=\mu mg\n\end{aligned}

Substitute the value of friction force in the above expression.

\begin{aligned}\mu mg&={F_(applied)}\n\mu\left({5*10}\right)&=20\n\mu &=\frac{{20}}{{50}}\n&=0.4\n\end{aligned}

Thus, the coefficient of kinetic friction between the box and the floor will be  \boxed{0.4}.

Learn More:

1. A 30.0-kg box is being pulled across a carpeted floor by a horizontal force of 230 N brainly.com/question/7031524

2. Choose the 200 kg refrigerator. Set the applied force to 400 n (to the right). Be sure friction is turned off brainly.com/question/4033012

3. Which of the following is not a component of a lever brainly.com/question/1073452

Answer Details:

Grade: High School

Subject: Physics

Chapter: Friction

Keywords:

Horizontal 20N force, 5 kg box, push, a rough horizontal floor, constant velocity, friction force, coefficient of kinetic friction, box and the floor.

An object, m=1.7 kg, is dropped from a ladder 2 m off the ground. What is the velocity of the object right before its hits the ground?

Answers

v^2 = u^2 + 2as
u=0 m/s
a=g=10 m/s^2
s=2 m

Discuss gravitational force and strong nuclear force. Describe at least two ways that they are alike and two ways that they are different.

Answers

 Gravitational force is the slight attraction of bodies caused by their masses. 

Strong nuclear force is the colossal force possessing protons together in an atomic nucleus. 
Alike: 

They are both attractive forces. 
They are both charge-independent 

Different: 

Vigorous nuclear force only applies to protons while gravity applies to all matter. 
Gravity occurs on all levels of space while the robust nuclear force only occurs at the sub-atomic level. 

Which is an example of the kinetic-molecular theory not holding true for a gas?The average kinetic energy of particles depends only on the temperature.
The particles in a gas travel in straight lines in a continuous, random motion.
The attraction between particles causes a gas to condense at low temperatures.
The particles in a gas make up a small portion of the total volume of the gas.

Answers

Answer: the third option, the attraction between particles causes a gas to condense at low temperatures

Explanation:

1) The kinetic-molecular theory explains the behaviour and properties of the gases in terms of the energy, size, and motion of its particles or molecules.

2) As per the size, the particles are considered to make a small portion of the total volume of the gas, to the point that their size is fully neglected (zero). The particles are considered to not occupy any space (volume) of the gas.

3) The first and the second statments are directly stated by the molecular-kinetic theory: a) the average kinetic energy of particles depends only on the temperature, and b) the particles in a gas travel in straight lines in a continuous, random motion.

Regarding the statement that the attraction between particles causes a gas to condense at low temperatures, this is not true.

First of all, the kinetic molecular theory of the gases is not valid at low temperatures and hight pressures.

Second, depending on the gas and the intermolecular force, at low temperarures a gas might condense or not. It depends on the attractive forces, which are neglected for gases by the molecular-kinetic theory.

Answer:

Explanation:this is the correct answer
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