Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 kmh-1?

Answer : The correct degree of precision is 272.94 g.

Explanation :

Precision : It is defined as the closeness of two or more measurements to each other.

For Example: If you weigh a given substance five times and you get 2.7 kg each time. Then the measurement is said to be precise.

Level of precision is determined by the maximum number of decimal places.

In the given figure, the value of mass of object is 280 g. From the given options we conclude that the 272.94 g is more close to 280 g and has maximum number of decimal places. So, 272.94 g measurement is said to be precise.

Therefore, the correct degree of precision is 272.94 g.

Answer:

The atomic particles given off as a result of nuclear fission are alpha and beta.

Explanation:

Answer:

Explanation:

(a) Force constant = force/displacement = 15/0.2

=75 N/m

(b) For SHM with spring, the angular frequency = sqrt ( force constant / mass )

= sqrt ( 75 / 1.8 )

= 6.455

Frequency = Angular frequency / 2pi

= 1.03Hz

(c) Maximum speed is when object's potential energy is at minimum.

1/2*mass*speed^2 = 1/2*force constant*displacement^2

speed^2 = 75*0.2^2/1.8 = 1.67

speed = sqrt (1.67)

= 1.29 m/s

(d) It occurs at x=0

(e) Maximum acceleration = Force / m = 15/1.8

= 8.33 m/s^2

(f) It occurs at x=0.2m

Answer:

Explanation:

given:

The mass of the object attached to the spring: m = 1.80 kg

The magnitude of the maximum horizontal force exerted: F = 15.0 N

The amplitude of the spring-object oscillation: A = 0.200 m

a. k=15/.2=75N/m

b. (2pi*frequency)^2 = k/m = 75/1.8 = 41.67

frequency = 1.03Hz

c. max speed^2 = amplitude^2*k/m = 0.2^2 * 41.67

max speed = 1.29 m/s

d. x=0m

e. max accel = F/m = 15/1.8 = 8.33 m/s^2

f. x=0.2m

e. energy = 1/2*k*A^2

= 1/2*75*0.2^2

= 1.5J

Answer:

The right approach will be "40K".

Explanation:

Answer:

DU = 21 KJ

Explanation:

Given the following data;

Quantity of heat = 125 KJ

Work = 104 KJ

To find the change in internal energy;

Mathematically, the change in internal energy of a system is given by the formula;

DU = Q - W

Where;

DU is the change in internal energy.

Q is the quantity of energy.

W is the work done.

Substituting into the formula, we have;

DU = 125 - 104

DU = 21 KJ

Answer:

1.0125 x 10^19

Explanation:

current flowing through conductive wire= 9mA = 9 x 10^ -3 A

charge passing per 3 min

Q = It

= 9 x 10^ -3 x (3 x 60)

= 1.620 C

no of electrons in charge

Q = ne

1.620 = n x 1.6 x 10 ^ -19

n. = 1.0125 x 10 ^19

Answer:

0.00025 kilometers

Explanation:

divide the length value by 1e+6

Answer:

250 mm = 0.00025 km.

Explanation:

250 mm equal 0.00025 km

Conversion details

To convert mm to km use the following formula:

1 mm equals 0.000001 km

So, to convert 250 mm to km, multiply 0.000001 by 250 i.e.,

250 mm = 0.000001 * 250 km = 0.00025 km

(hope this helps can i plz have brainlist :D hehe)

Explanation:

70N-40N=30N

Answer:

A) but be sure and read the answer.

Explanation:

If the object does not move at all, (that's an important restriction) the net force = 0. That being so, the acceleration must be 0 as well. But there is no law saying that there cannot be a constant motion and that's why the restriction is important.

If a person gets into the rowboat, the water level at the edge of the pool will rise slightly. This is because the weight of the person adds to the weight of the boat and displaces more water, causing the water level to rise.

The amount of the rise in water level will depend on the weight of the person and the size of the boat. Similarly, if objects are added to the boat, the water level at the edge of the pool will also rise. However, if the boat is empty and just floating in the pool, it will displace a certain amount of water and the water level at the edge of the pool will be at the marked level.

Overall, the water level in the pool is determined by the amount of water displaced by the rowboat and any additional weight that is added to it.

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Answer:

if somthing is warm or if somthing moves it usally has energy

Answer:it is b i just did this

Explanation:

Answer: i think its b hope this helped :)

Explanation:

One statement that is not true is that UV radiation is a type of electromagnetic radiation. It is also a type of ionizing radiation. UV radiation is actually a form of non-ionizing radiation.

UV radiation, or ultraviolet radiation, is a type of electromagnetic radiation that falls between visible light and X-rays on the electromagnetic spectrum. It is often categorized into three types: UVA, UVB, and UVC. Unlike ionizing radiation, such as X-rays and gamma rays, which have enough energy to remove tightly bound electrons from atoms or molecules, UV radiation lacks the necessary energy to ionize atoms or molecules. Instead, it primarily interacts with the outermost electrons of atoms or molecules, leading to chemical reactions and causing biological effects.

UV radiation is commonly associated with sunlight and has various effects on living organisms and materials. It can cause sunburn, premature aging of the skin, and an increased risk of skin cancer. Exposure to excessive UV radiation can also damage the eyes and impair the immune system. It is important to protect oneself from excessive UV exposure by wearing sunscreen, protective clothing, and sunglasses.

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four wheels, powered by an internal combustion engine or electric motor, used for transportation on roads. It has greatly impacted modern society, providing mobility and convenience but also contributing to issues such as pollution and traffic congestion.

The motor car is a widely used form of transportation in modern society. It is a vehicle that typically has four wheels and is powered by either an internal combustion engine or an electric motor. Cars have greatly impacted the way people live and work by providing mobility and convenience. However, they also contribute to issues such as air pollution, traffic congestion, and accidents. The development of cars has led to the creation of road networks and the growth of suburban and urban areas. Overall, the motor car is an integral part of modern life but also has its downsides.

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Answer:

Explanation:

From the question we are finding the final velocity of the bicycle

To find the final velocity given the initial velocity , acceleration and time we use the formula

v = u + at

where

v is the final velocity

u is the initial velocity

a is the acceleration

t is the time

From the question

u = 10 m/s

a = 6 m/s²

t = 20 s

Substitute the values into the above formula and solve

That's

v = 10 + 6(20)

= 10 + 120

We have the final answer as

Hope this helps you.

Answer:B

26m/s

Explanation:

31,637.2 J of heat is required to change 10g of ice at exactly 0°C to steam at 100°C.

The amount of heat required to change 10g of ice at 0°C to steam at 100°C is calculated by considering the three different stages of change in water, and using the specific heat capacity of each stage.

First, we need to calculate the amount of heat needed to raise the temperature of the ice from -273°C to 0°C. This can be done using the specific heat capacity of ice, which is 2.09 J/g°C:

Q1 = m × c × ΔT = 10 g × 2.09 J/g°C × (0°C - (-273°C)) = 5,731.7 J

Next, we need to calculate the amount of heat needed to melt the ice. This can be done using the specific heat of fusion of ice, which is 333.55 J/g:

Q2 = m × ΔHfus = 10 g × 333.55 J/g = 3,335.5 J

Finally, we need to calculate the amount of heat needed to vaporize the water. This can be done using the specific heat of vaporization of water, which is 2,257 J/g:

Q3 = m × ΔHvap = 10 g × 2,257 J/g = 22,570 J

The total amount of heat required is the sum of Q1, Q2, and Q3:

Q = Q1 + Q2 + Q3 = 5,731.7 J + 3,335.5 J + 22,570 J = 31,637.2 J

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Answer:

88.34 N directed towards the center of the circle

Explanation:

Applying,

F = mv²/r................... Equation 1

F = Force needed to keep the mass in a circle, m = mass of the mass, v = velocity of the mass, r = radius of the circle.

But,

v = 2πr/t................... Equation 2

Where t = time, π = pie

Substitute equation 2 into equation 1

F = m(2πr/t)²/r

F = 4π²r²m/t²r

F = 4π²rm/t²............. Equation 3

From the question,

Given: m = 0.8 kg, r = 0.7 m, t = 0.5 s

Constant: π = 3.14

Substitute these values into equation 3

F = 4(3.14²)(0.7)(0.8)/0.5²

F = 88.34 N directed towards the center of the circle

Answer:

Temperature change

Explanation:

Answer:

ENQUIRE is the answer

Explanation: google....internet browser-.. .-.

Enquire was a software project written in 1980 by Tim Berners-Lee at CERN, which was the predecessor to the World Wide Web

Answer:

Earthworm lives in the soil, eats the soil which has organic matter such as decaying vegetation or leaves and crawls. While housefly lives in dirty places, feeds on faeces and flies.

Hope I get a brainliest answer.

Answer:

less force

Explanation:

less force because they is increase in area and not enough energy to balance the whole equation

Answer:

the same

Explanation:

Answer:

      k = \(\frac{g \ m_1}{L}\)

Explanation:

In this exercise the two cases presented are a simple harmonic motion, with angular velocity

spring - mass                                      w² = k / m₁

simple pendulum (string- mass m₂)  w² = g / L

angular velocity and period are related

              w = 2π/ T

since they indicate that the two periods are equal, the angular velocities are also equal, therefore we can equal the two equations

             \(\frac{k}{m1} = \frac{g}{L}\)

             k = \(\frac{g \ m_1}{L}\)

Answer:

first page answer is B

second page answer is D

Explanation:

The maximum displacement, x = A = 0.020m. Plugging in the values for k, m, and x, we can solve for A: A = x = 0.020m. The maximum speed of the object is v = sqrt(2*a*x) = sqrt(2*0*0.020) = 0 m/s. The object does not attain any maximum speed.

a) The amplitude of simple harmonic motion is the maximum displacement from the equilibrium position. Given that the object is 0.020m from its equilibrium position and attached to a spring with spring constant k=280N/m, we can use the equation for simple harmonic motion: x = A*cos(w*t), where x is the displacement from the equilibrium position, A is the amplitude, w is the angular frequency (w = sqrt(k/m)), and t is time. At the maximum displacement, x = A = 0.020m. Plugging in the values for k, m, and x, we can solve for A: A = x = 0.020m.

b) The maximum speed of the object occurs at the equilibrium position, where the displacement is zero and the acceleration is maximum. The acceleration at the equilibrium position is a = -(k/m)*x = -(280N/m)/(2.7kg)*0 = 0 m/s^2. Therefore, the maximum speed of the object is v = sqrt(2*a*x) = sqrt(2*0*0.020) = 0 m/s. The object does not attain any maximum speed.

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Explanation:

It is not really a squandering of time. You may come into instances throughout your life in which you would wished you had a comprehensive understanding of science. Nevertheless, whether you seem to be not fascinated with it and have something more scheduled for you, you might devote the majority of your efforts to whichever you believe is not really a waste of time.

According to the statement, on the ball thrown upward from the ground, it will reach the ground at time t=12 seconds.

The ball will reach the ground at time t when its vertical displacement is zero. We can use the equation for vertical displacement, \(y = v0t - (1/2)gt^2\), where v0 is the initial velocity, g is the acceleration due to gravity, and t is the time. Plugging in the given values, we get:

\(0 = 60t - (1/2)(10)t^2\)

Rearranging the equation and factoring out t, we get:

t(60 – 5t) = 0

This gives us two possible values for t: 0 and 12 seconds. Since the ball is thrown at t=0, the time when it reaches the ground is t=12 seconds.

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A particle with no electric charge and not experiencing a force parallel to its direction of motion would be an accelerating particle that does not generate electromagnetic waves.

An accelerating particle that does not generate electromagnetic waves could be a particle with no electric charge, such as a neutral particle like a neutron. Electromagnetic waves are produced when charged particles undergo acceleration, causing a disturbance in the electromagnetic field that propagates outward as a wave. If a particle has no electric charge, it will not interact with the electromagnetic field and thus will not produce electromagnetic waves.

If a charged particle is moving along a path perpendicular to an external magnetic field, it will experience a force perpendicular to its velocity but not parallel to it, so the particle will not accelerate parallel to its direction of motion.

This is known as the Lorentz force, and it may cause the particle to move in a circular or helical path, but it will not cause the particle to accelerate in a straight line and generate electromagnetic waves.

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