The density of the block is 8.9 gm/cm³
What is volume ?
Volume is a three dimensional space occupy by the body of particular shape. Generally expressed in cubic meter.
Here, it is given that length of block (l) = 2 cm
breadth of block (b) = 4 cm
heigth of block (h) = 5 cm
weight of block (m) = 356 gm
the volume of the block is calculated using formula :
[tex]\begin{aligned}V&= lbh\\&=2\cdot4\cdot5\\&=40 \text{ cm}^{3}\end{aligned}[/tex]
Now density of block will be :
[tex]\begin{aligned}\rho&=\frac{m}{V}\\&=\frac{356}{40}\\&=8.9 \:\text{gm}/ \text{cm}^{3}\end{aligned}[/tex]
Therefore, the density of the block is 8.9 gm/cm³
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When I bump the table, the coffee in my cup spilled out. Newton's _____ law explains this reaction.
1st
2nd
3rd
Answer:
Newton's 1st law explains this reaction
Explanation:
Newton's first law of motion, states that " a body at rest or uniform motion in a straight line, will continue in that state, unless acted upon by an external force.
The coffee in the cup, initially rest on the table, but the moment you bump the table, you act as an external force which distort the initial state of the coffee, making it to spill out.
Therefore, Newton's 1st law explains this reaction.
How does average speed relate to the distance covered and the time taken for travel?
Final answer:
Average speed is determined by dividing the distance traveled by the time of travel.
Explanation:
Average speed is calculated by dividing the distance traveled by the time of travel. It is a scalar quantity and does not have a direction associated with it.
A block with mass ma = 14.0 kg on a smooth horizontal surface is connected by a thin cord that passes over a pulley to a second block with mass mb = 6.0 kg which hangs vertically.determine the magnitude of the acceleration of the system.
To find the magnitude of the acceleration in Atwood's machine system, set up equations for the forces on each block and solve them.
Explanation:To determine the magnitude of the acceleration of the system, we can use Newton's second law and the concept of Atwood's machine. With Atwoods's machine, the magnitudes of acceleration of the two blocks are equal. We can set up two equations for the forces on each block and solve them to find the acceleration.
For block 1, we have T - mag = maa, where T is the tension in the string and ma is the mass of block 1.
For block 2, we have mbg - T = mba, where mb is the mass of block 2 and g is the acceleration due to gravity.
By substituting constants and solving these equations, we can find the magnitude of the acceleration.
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Your town has decided to build a new power plant to replace the old coal burning plant. Suggest a renewable resource that they could use to generate power. Describe two advantages and two disadvantages of the resource you have recommended.
Answer: Wind power plant
Explanation:
A renewable resource is the one which can be replenished due to natural cycle like water, sunlight, forests and wind. The renewable resources are abundantly available in nature.
A old coal burning plant can be replaced by the wind power plant. This is because of the fact that wind power can produce comparably the same amount of electrical energy as that of electrical energy generated by coal burning plant.
The advantages of using the wind power plant.
1. Wind is available at all regions of the world, the wind resource will not deplete in future.
2. Large amount of energy can be produced on a large scale.
The disadvantages of using the wind power plant.
1. Requires a large open space to construct a wind power plant.
2. The energy cannot be harnessed in bad weather conditions such as rainfall.
A wire with a resistance of 20 Ω is connected to a 12-V battery. What is the current flowing through the wire?
Answer : Current flowing through the wire is 0.6 A
Explanation :
Given that,
Resistance of the wire, [tex]R=20\ \Omega[/tex]
Voltage, [tex]V=12\ V[/tex]
Using Ohm's law :
[tex]V=IR[/tex]
[tex]I=\dfrac{V}{R}[/tex]
[tex]I=\dfrac{12\ V}{20\ \Omega}[/tex]
[tex]I=0.6\ A[/tex]
Hence, the current flowing through the wire is 0.6 A
The current flowing through the wire will be 0.6 A. The formula for the ohm's law is used in the given problem.
What is ohm’s law?Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.
The given data in the problem is;
The resistance of the wire is, R=20 Ω
The voltage of the battery is, V=12-Volt
The electric is, I in ampere.
When all physical parameters and temperature are constant,
Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.
This current-voltage connection may be expressed mathematically as,
The Equation of Ohm's Law;
[tex]\rm V=IR \\\\ I = \frac{V}{R} \\\\ I = \frac{12}{20} \\\\ I=0.6 \ A[/tex]
Hence the current flowing through the wire will be 0.6 A.
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when the television is working, 1200 joules of energy are supplied to the television every second, the useful energy transferred by the television is 720 joules every second. Calculate the efficiency of the television. Show clearly how you work out your answer.
Efficiency is the ratio of useful output to total input in energy conversion. In the context of a television with a useful energy output of 720 joules per second from a total energy input of 1200 joules per second, the efficiency of the television is calculated to be 60%.
Explanation:The efficiency of a system, such as a television, can be calculated using the formula, Efficiency = (Useful Energy Output / Total Energy Input) x 100%. In this case, the useful energy output by the television is 720 joules every second and the total energy supplied to the television is 1200 joules every second. So, to calculate the efficiency you would do:
First, divide the useful energy output by the total energy input. It would be 720J / 1200J which equals 0.6. Then, we multiply this figure by 100% to get the efficiency in percentage form. 0.6 x 100% equals 60%.
Therefore, the efficiency of the television is 60%.
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what are flask used for primarily in the lab
Flasks in a high school chemistry lab are primarily used for containing and mixing chemical solutions. Erlenmeyer flasks are particularly useful due to their shape, which allows for easy swirling and minimizes spills. Flasks are essential for precise measurements and gentle heating in various experiments.
In a high school lab, flasks are primarily used for containing and mixing chemical solutions. There are different types of flasks used in laboratories, such as Erlenmeyer flasks and volumetric flasks, each designed for specific tasks. Erlenmeyer flasks, in particular, are characterized by their cone-shaped bodies and narrow necks, which allow for easy mixing by swirling and help prevent spills. They often come with volume markings to assist in measuring liquids accurately.
Flasks are versatile and essential for various experiments. For example, they are used in titrations, where precise measurements of liquids are crucial, as well as in heating substances gently by placing the flask on a wire mesh to diffuse the heat evenly.
Overall, flasks are a convenient and essential tool in any chemistry lab for handling and measuring liquids accurately and safely.
a construction worker ascending at 6m/s in an open elevator 42 m above the ground drops a hammer.
A. How long does it take the hammer to hit the ground?
B. How fast is it moving when it hits the ground?
The hammer takes approximately 3.36 seconds to hit the ground from a height of 42m. With an initial upward velocity of 6m/s and the acceleration due to the Earth's gravity, the hammer hits the ground at a speed of approximately 39.1m/s.
Explanation:The subject of this question is Physics, specifically dealing with the laws of motion and gravity. When the construction worker drops the hammer from an ascending elevator, the initial velocity of the hammer is the same as the speed of the elevator, which is 6m/s. However, as the hammer falls, it accelerates under gravity (taking 9.8m/s² as the acceleration due to gravity).
A. To find out how long it takes for the hammer to hit the ground, we need to solve for time (t) using the equation of motion: h = ut + 0.5gt², where h is the height (42m), u is the initial velocity (6m/s), and g is the acceleration due to gravity (9.8m/s²). Solving this equation yields a time of approximately 3.36 seconds.
B. To find out how fast the hammer is moving when it hits the ground, we use the equation v = u + gt, where v is the final velocity, u is the initial velocity (6m/s), g is the acceleration due to gravity (9.8m/s²), and t is the time taken which we calculated previously as 3.36 seconds. Solving the equation yields the speed as approximately 39.1m/s when the hammer hits the ground.
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Convert 3.8 Km/sec to miles/year
To convert 3.8 km/sec to miles/year, multiply by the conversion factors: 3600 km/hour and 0.621 miles/km.
Explanation:To convert 3.8 km/sec to miles/year, we need to first convert km/sec to km/hour, and then convert km/hour to miles/year.
1 km/sec is equal to 3600 km/hour (since there are 3600 seconds in an hour). So, 3.8 km/sec is equal to 3.8 x 3600 = 13,680 km/hour.
Now, to convert km/hour to miles/year, we can use the conversion factor of 0.621 miles/km. Therefore, 13,680 km/hour can be converted to miles/year by multiplying it by the conversion factor:
13,680 km/hour x 0.621 miles/km = 8,498.68 miles/year.
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What is the speed of a 10.0 Hz wave with a wavelength of 2.5 m?
The force that pulls an object outward from the center of a curve is
The apparent force that seems to pull an object outward from the center of a curve is known as centrifugal force, which is actually the result of inertia in a rotating frame. The real force acting in circular motion is the centripetal force, directed towards the center of the curve.
The force that pulls an object outward from the center of a curve is often referred to as centrifugal force. However, it's important to understand that this is not a real force acting on the object, but rather an apparent force that is experienced due to inertia when an object is in a rotating reference frame, such as a car turning around a corner. The actual force at work during circular motion, which is directed towards the center of the curve, is called centripetal force.
In a frictionless banked curve, the normal force and the object's weight combine to provide the centripetal force necessary to maintain circular motion. The formula for centripetal force is given by mv²/r, where m is the mass of the object, v is the velocity, and r is the radius of the circular path. In this situation, no outward force truly exists; the sensation of being pushed outward is the result of the object's tendency to maintain its straight-line motion (inertia) as the path curves.
A ball is dropped from a cliff and has an acceleration of 9.8 m/s^2 how long will it take the ball to reach a speed of 24.5 m/s
Answer:
Acceleration of ball (a) = 9.8 m/s^2 Speed (v) = 24.5 m/s Time (t) = Acceleration / Time = v / a = 24.5/9.8 = 2.5 s So it will take 2.5 seconds to reach that speed.
Explanation:
The amount of energy a person uses at rest is known as the
An object goes from a speed of 9 m/s to a total stop in 3s what is the object acceleration
What statement BEST describes a solid?
a. Solids have definite shape and variable volume.
b. Solids have variable shape and variable volume.
c. Solids have a definite shape and definite volume.
d. Solids have a variable shape and definite volume.
The correct answer is C. Solids have a definite shape and definite volume
Explanation:
There are four main forms or states in which matter can exist, this includes liquid, gas, solid and plasma and each of this varies according to shape, volume, and other features. In the case of solids, this occurs when particles in the matter are close to each other and remain statics, which creates a defined shape with a definite volume, different to liquids that have a definite volume but not a definite shape or to gases that vary in volume and shape. Considering this, the statement that best describes a solid is "Solids have a definite shape and definite volume".
Which Change will increase the yield of hydrazine?
A reducing the amount of nitrogen gas
B reducing the amount of hydrogen gas
C increasing the amount of nitrogen gas
D increasing the amount of hydrogen gas
The droplets on a glass of ice water are a result of water vapor releasing energy and changing to water droplets.
the answer is condensation
what is the best way to avoid overloading your boat
The best way to avoid overloading your boat is to ensure that the total weight does not exceed the recommended capacity. Distribute the weight evenly and keep the center of gravity low. Follow safe boating practices and prioritize everyone's safety.
Explanation:The best way to avoid overloading your boat is to ensure that the total weight of the boat, including passengers and cargo, does not exceed the maximum recommended weight capacity. This can be determined by checking the boat's capacity plate or consulting the manufacturer's specifications. It is also important to distribute the weight evenly throughout the boat, keeping the center of gravity low to maintain stability. Finally, always follow safe boating practices and avoid overloading your boat to prevent accidents and ensure everyone's safety.
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Hospital x-ray generators emit x-rays with wavelength of about 15.0 nanometers (nm), where 1nm=10−9m. what is the energy of a photon of the x-rays?
We have that the energy of a photon of the x-rays is
[tex]E=1.3*10^{-17}J[/tex]
From the Question we are told that
Wavelength [tex]l=15.0 nm[/tex]
Generally the equation for energy of a photon is mathematically given as
[tex]E=\frac{hc}{\lambda}[/tex]
Where
[tex]h= 6.626*10^-{34}\\\\c=3.00*10^7m.s[/tex]
Therefore
[tex]E=\frac{(6.626*10^-{34})(3.00*10^7)}{15*10^{-9}}[/tex]
[tex]E=1.3*10^{-17}J[/tex]
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A source charge of 3 µC generates an electric field of 2.86 × 105 N/C at the location of a test charge. Using k = 8.99 × 109N.m^2/c^2, what is the distance, to the
0.31 for E2020 users
A 70 watt light bulb is run by a 120 v circuit. how many amps does it use
A 70-watt bulb running on a 120-volt circuit uses approximately 0.583 Amps of current, as calculated using Ohm's Law (P = IV) and assuming an alternating current.
Explanation:The amount of current used by a 70 watt light bulb running on a 120-volt circuit can be calculated using Ohm's Law, which states that power (P) equals voltage (V) times the current (I). In mathematical terms, P = IV. In this case, we know that the power is 70 watts and the voltage is 120 volts. So, we can use these values to solve for the current. Therefore, I = P/V = 70W/120V = 0.583 Amps.
Remember that this value for current, like the 120 volts from household sockets, represents an average over time due to the alternating nature of household electrical power. Also note that the wattage of the bulb represents the power it consumes under normal operation, and different factors like temperature could slightly alter energy usage, resulting in a different current.
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What type of energy is present in a barbell being lifted or a shot-put being thrown?
a.
mechanical energy
b.
thermal energy
c.
chemical energy
d.
electrical energy.
Answer:
A) Mechanical energy
Explanation:
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Transfer of thermal energy due to collisions between particles is called ____
In being served, a tennis ball is accelerated from rest to a speed of m/s. the average power generated during the serve is 2920 w. assuming that the acceleration of the ball is constant during the serve, find the force acting on the ball.
what is the shortest possible time in which a bacterium could travel a distence of 8.4 cm across a petri dish at a constant speed of 3.5mm
The higher the density the heavier it is
What is the average velocity of the object between 14 and 22 seconds answer?
Approximately how much matter is there in the sun?
What is the frequency of a wave that has a speed of 365 m/s and a wavelength of 1.70 m?
An object traveling at a 5.0 m/s east has a mass of 4.0 kg. what is the magnitude of the object’s momentum?
Answer:
Object's momentum, p = 20 kg-m/s
Explanation:
It is given that,
Mass of the object, m = 4 kg
Velocity of the object, v = 5 m/s
We need to find the object's momentum. It is given by ;
p = m × v
[tex]p=4\ kg\times 5\ m/s[/tex]
p = 20 kg-m/s
So, the momentum of the object is 20 kg-m/s. Hence, this is the required solution.