What is the mass of an object that has a density of 1.3 g/cm3 and a volume
of 2 cm3? (The density of an object has the equation d =m/v.)
O
O A. 1.5 g
O B. 3.39
O C. 0.7g
O D. 2.6g
O
​

Answer:

Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion.

Explanation:

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Answer:

1543 J

Explanation:

The work done by a force when moving an object is given by the equation:

[tex]W=Fd cos \theta[/tex]

where:

F is the magnitude of the force applied on the object

d is the displacement of the object

[tex]\theta[/tex] is the angle between the direction of the force and of the displacement

For the  cart pushed in this problem, we have:

[tex]F=120 N[/tex] is the force applied by the man

[tex]d=20 m[/tex] is the displacement of the cart

[tex]\theta=50^{\circ}[/tex] is the angle between the directions of the force and of the displacement

Solving for W, we find the work:

[tex]W=(120)(20)(cos 50^{\circ})=1543 J[/tex]

Answer: the speed after 4seconds is 11m/s

Explanation:

Answer:

The approximate terminal velocity of a sky diver before the parachute opens is 320 km/h.

Explanation:

                           Buoyancy force + drag force = Gravity

After 2 seconds the particle will be in position

[tex]x(2)=10+12\cdot 2^2=10+12\cdot 4=10+48=58[/tex]

After 5 seconds the particle will be in position

[tex]x(5)=10+12\cdot 5^2=10+12\cdot 25=10+300=310[/tex]

So, the particle will travel

[tex]310-58=252[/tex]

meters in 3 seconds, for an average speed of

[tex]\dfrac{252}{3}=84[/tex]

Final answer:

The average speed of the particle between t = 2s and t = 5s, using the function x = 10 + 12t^2, is calculated by finding the total distance traveled in that time frame and dividing it by the time elapsed, which gives an average speed of 84 m/s. So the correct option is C.

Explanation:

To find the average speed of a particle between time t = 2s and t = 5s using the equation x = 10 + 12t2, we need to calculate the total distance travelled by the particle over that time period and then divide by the total time elapsed.

Therefore, the correct answer is C. 84 ms-1.

Answer:

a) Explanation below. b) Explanation below

Explanation:

Torque is defined as the product of a force by a radius, while momentum is defined as the product of force by a distance. Mathematically we would have

T = F * r

M = F * d

where:

T = torque = [N*m]

M = moment = [N*m]

F = force =[N]

d = distance [m]

r = radius [m]

Although they have the same units, the difference between them is the application. For the case of torque this is always applied in parts that are in rotation, such as the shafts of cars, the shafts of pumps, torque in gears and etc. While the moment can be applied to a body without the need for it to rotate.

A couple, is as its name suggests a couple of forces of equal magnitude but opposite sense and do not share a line of action. A body under the action of a couple of forces tends to rotate the body without moving it from one point to another.

Answer:the awnser is c

Explanation:

Awnser

Answer:

C

Explanation:

2.72 N

Explanation:

Step 1:

From the basic formula in electrostatics

F = E * q

where F = Force due to charges

           E = Electric field strength

           q = Charge

Step 2:

From the given question

q= [tex]8.5*10^{-6} C[/tex]

E = [tex]3.2 * 10^{5} N/C[/tex]

F = [tex]8.5 * 10^{-6} * 3.2 * 10^{5} = 2.72[/tex] N

Answer:

B

Explanation:

E2020

To compare the brightness of light bulbs, you should look for the luminous flux in lumens on their labels, as this measures the perceived power of light by the human eye, offering a more accurate representation of brightness than wattage alone.

To compare the brightness of light bulbs for sale in a store, you should look on the labels to see how they are rated in terms of luminous flux, which is measured in lumens (lm). The luminous flux is a measure of the perceived power of light by the human eye. Energy-saving light bulbs like compact fluorescent lamps and LED bulbs provide more luminous flux for a given use of electricity, meaning they have higher luminous efficacy, represented in lumens per watt. When replacing an old incandescent bulb with an energy-saving one, it is important to compare lumens to ensure the same level of brightness is achieved.

Traditionally, people have been accustomed to associating the brightness of a bulb with its power consumption in watts due to the prevalence of incandescent bulbs. However, as technology has advanced, the importance of comparing lumens, rather than just wattage, has become clear for a more accurate representation of a bulb's light intensity. A higher wattage does not necessarily mean more visible light, since not all electrical power is converted into visible light. Also, different types of bulbs convert electricity to light with varying efficiencies.

Note: The efficiency of a light bulb, which is the fraction of its total light output that falls within the visible range, is never 100% due to the nature of thermal sources and the distribution of emitted wavelengths.

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Answer:14.52joules

Explanation:

Mass(m)=7.26kg

Velocity(v)=2m/s

Kinetic energy=(mv^2)/2

Kinetic energy=(7.26x2^2)/2

Kinetic energy =(7.26x4)/2

Kinetic energy =29.04/2

Kinetic energy =14.52joules

Answer:

32.71 L

Explanation:

We can solve this question using Boyle's law of ideal gas. The law states that the volume and pressure are inversely proportional when the temperature is constant. At first, the volume is 18L (V1) and the pressure is 87.6 kPa(P1). Then the pressure changed into 48.2 kPa(P2). We are asked to find the volume(V2).

The calculation will be:

P1 * V1= P2 * V2

87.6 kPa  *18L = 48.2 kPa * V2

V2=  87.6 kPa  *18L / 48.2 kPa

V2=32.71 L

Answer:

Wave speed = 50 m[tex]s^{-1}[/tex]

Explanation:

Given

Wavelength = 5 m

Frequency = 10 Hz = 10 [tex]s^{-1}[/tex]

wave speed = ?

We know that all waves have same relationship among wavelength λ, frequency f and speed v , which is given by

   v = fλ

Therefore wave speed = 10 [tex]s^{-1}[/tex] x 5 m = 50 m[tex]s^{-1}[/tex]

Answer:73.47kg approximately

Explanation:

Weight(w)=720N

Acceleration due to gravity(g)=9.8m/s^2

Mass(m)=?

Mass=w/g

Mass=720/9.8

Mass=73.47kg approximately

To determine the mass of an object with a weight of 720 N, use the formula w = mg and divide the weight by Earth's gravitational acceleration, yielding a mass of 73.47 kilograms.

To find the mass of an object that weighs 720 N on the surface of Earth, we can use the formula for weight, which is w = mg, where w is weight in newtons, m is mass in kilograms, and g is the acceleration due to gravity in meters per second squared (m/s²). On Earth, g = 9.80 m/s².

Starting with the weight equation:

Therefore, the mass of the object on Earth is 73.47 kilograms.

Answer:

Explanation:

The picture shows a crushed can inside a bowl with iced water.

This experiment consists on pouring a small amount of water inside a can, heating the can directly on a kitchen burner, using a heat insulating clamp, and placing the can with the open end face down in a bowl with iced water.

The particles inside the can, when heated on the kitchen burner will expand, since the heat supplied increases the kinetic energy of the particles vigorously. Since the can is open, the pressure inside the can equals the pressure outside the can (the atmospheric pressure).

When the can is put face down in contact with the iced water, the air inside the can will cool down rapidly, causing the pressure (according to Boyle's law) to decrease quickly.

Now, there will be a huge difference between the atmospheric pressure and the pressure inside the can, which will generate a net force pointing radially toward the can strong enogh to crush the can.

Answer:

Acceleration of gravity=[tex]9.8m/s/s[/tex]

Explanation:

Newton's Second Law-acceleration is proportional to the net force acting on an object.

All objects usually free fall at the same acceleration of [tex]9.8m/s/s[/tex]-this regardless of their mass. This acceleration is known as acceleration of gravity.

C. The water is using heat to undergo a phase change and

D. The water's latent heat of vaporization is being pulled from your body.

Explanation:

As per the Thermodynamics, to attain equilibrium, the heat always travel to cold and also high energy particle moving towards the lower energy side.

Here water we pour on our self getting dried naturally before we toweling off.

It is due to the water using the heat to gradually undergo a kind of phase change and also the latent heat of vaporization is being pulled from our body.

The final velocity of the car A after collision is 1.884 m/s.

Explanation:

As per law of conservation of energy, the momentum of objects before collision is tend to be same for the momentum of objects after collision, in case of elastic collision.

So, from those equation, we can derive the final velocities for both the objects after collision.

[tex]v_{1} = \frac{m_{1}- m_{2} }{m_{1} + m_{2} } u_{1}+ \frac{ 2*m_{2} }{m_{1} + m_{2} } u_{2}[/tex]

[tex]v_{2} = \frac{2*m_{1} }{m_{1} + m_{2} } u_{1}+ \frac{ m_{2}- m_{1} }{m_{1} + m_{2} } u_{2}[/tex]

So if we consider the car A is having a mass m1 which is equal to 281 mc kg with initial velocity before collision as u1 = 2.82 m/s. And then the car B will be having the mass m2 equal to 209 mc kg with the velocity of 1.72 m/s. So if the final velocity of car A after collision is required to determine then we have to solve the formula for v1

[tex]v_{1} = \frac{m_{1}- m_{2} }{m_{1} + m_{2} } u_{1}+ \frac{ 2*m_{2} }{m_{1} + m_{2} } u_{2}[/tex]

[tex]v_{1} = \frac{281- 209 }{281 + 209} } * 2.82+ \frac{ 2*209 }{281+209}*1.72[/tex]

[tex]v_{1} = \frac{72 }{490} } * 2.82+ \frac{ 418 }{490}*1.72[/tex]

[tex]v_{1} = 0.414+1.47=1.884[/tex]

So the final velocity of the car A after collision is 1.884 m/s.

Answer:

A few examples of acceleration are the falling of an apple, the moon orbiting around the earth, or when a car is stopped at the traffic lights. Through these examples, we can understand that when there is a change in the direction of a moving object or an increase or decrease in speed, acceleration occurs. Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt. This allows you to measure how fast velocity changes in meters per second squared (m/s^2). Acceleration is also a vector quantity, so it includes both magnitude and direction.

Explanation:

Acceleration can be caused by a hill, wind, water movement, and a stop light.

The options that would most likely cause acceleration are a hill, wind, water movement, and a stop light.

A hill causes acceleration when an object rolls down due to the force of gravity. Wind can cause acceleration if it pushes an object. Water movement can cause acceleration if it exerts a force on an object. Finally, a stop light can cause acceleration when a car goes from a stationary position to moving quickly when the light turns green.

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Final answer:

A species is a group of individual organisms that have similar characteristics they pass to their offspring, can interbreed, and produce fertile offspring. These characteristics can include adaptations to their environment and shared physical traits.

Explanation:

The group of animals you are referring to is known as a species. A species is a group of individual organisms that interbreed and produce fertile, viable offspring. They share genetic characteristics that are passed along to their offspring, ensuring they belong to the same species and exhibit similar features such as body size and shape. Members of a species often share adaptations that enhance survival and reproduction within their environment. When observing a species, it's clear that offspring are not exact replicas of their parents but rather a blend of their traits, showing continuous variation. The concept of species is fundamental in understanding biological diversity and the process of inheritance.

For example, all humans belong to the species Homo sapiens and children inherit a combination of traits from their parents. This same principle applies across various animal species, indicating the shared process of genetic transmission and reproduction.

The M and N represents the electrical and kinetic energy, respectively.

Explanation:

As the law of conservation of energy states that energy can neither be created nor be destroyed, it can only be transferred from one form of energy to another. So in the case of ceiling fan, the electrical energy which is used to switch on the fan, is transferred as the kinetic energy of the blades of the fan for its working. Thus, the energy transfer diagram will show the transfer of electrical energy to kinetic energy.

So, the M and N in the energy transfer diagram will represent electrical and kinetic energy, respectively.

Answer: c) N= electrical energy and M= kinetic energy

Explanation:

The options are:

a) N= electrical and M= potential energy

b) N=light energy and M= electrical energy

c) N= electrical energy and M= kinetic energy

d) N= mechanical energy and M= electrical energy

In the ceiling fan we have:

We have that for a ceiling fan:

When we turn it on, we allow electrical current to flow into the fan system.

That electrical current is used to move the blades of the fan, in this way creating a wind current. As you may know, the energy of the movement is called kinetic energy.

So we have that the conversion here is Electrical energy into Kinetic energy, so the correct option is c.

Answer:

K = 8

Explanation:

The magnitude of k can be found using Pythagoras theorem.

Given hypotenuse L = 10

J = 6

K = ?

L^2 = J^2 + k^2

Therefore

10^2 = 6^2 + k^2

10 x 10 = 6 x 6 c k^2

100 = 36 + k^2

Subtract 36 from both sides

100 - 36 = 36 - 36 + k^2

64 = k^2

K^2 = 64

K = squared root of 64

K = 8

Answer:

The order of magnitude of speed of light in S.i. units is 8. Therefore c=3×10^8 meter / second.

Explanation:

If 600 J of work is done in 38 hours, the power is 0.00439 watt.

Answer:opposite sign, but same magnitude

Explanation:

Answer:

Explanation:

When an object moves through a fluid, like air, water or oil, the object experiences a resistance to flow; this is, to pass through the fluid.

This resistance force is the fluid friction.

In few words, fluid friction is a force that opposes the motion of the objects through the fluid.

Then, in the abscence of fluid friction, all objects falling accelerate at the gravity acceleration.

Answer:

Global climate change is an average long-term changes over the entire Earth in temperature, weather etc.

Explanation:

Answer:

work = 0

Explanation:

Let's remember that work is defined as the product of a force by a distance. Distance is the physical path displaced by the body under the action of that force.

W = F * d

where:

W = work [J]

F = force [N]

d = distance [m]

In this case, the toy is held at a height, there is no displacement from one point to another. So there is no work and this is equal to zero.

W = (2*9.81) * 0 = 0 [Joules]

Answer:

NO work is done on or by the object

Explanation: I go to school