Example of a single displacement reaction is

Answers

Answer 1

Answer:

The reaction of zinc withhydrochloric acid. Zn + 2HCl → H2 + ZnCl2. In here, zinc, an element, willreplace the halogen chlorine in the compound hydrochloric acid to form ahydrogen gas and zinc chloride molecule.

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PLEASE help me with these questions as soon as possible i need to turn it in!!!!A 60 watt light bulb uses 60 joules of electrical energy every second. However, only 6 joules of electrical energy is converted into light energy each second. a. What is the efficiency of the light bulb? Give your answer as a percentage.b. What do you think happens to the “lost” energy?19. The work output is 300 joules for a machine that is 50% efficient. What is the work input?20. A machine is 75% efficient. If 200 joules of work are put into the machine, how much work output does it produce?
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What is the mass of an object weighing 63 N on Earth?

Answers

Weight expressed in Newtons is expressed in the equation whereby Weight= the mass of an object * the force of gravity. The force of gravity on earth is a constant 9.8 meters per second squared. Therefore if weight (w) = 63 N and the force of gravity is 63 N then the mass must equal 6.43 kg. Because the equation for weight is w=mg so 63 N (w) = m * 9.8 m/s^2.

Any object that has mass and takes up space is considered

Answers

Matter. I don't really know how to explain it. Sorry. But anyways, Hope this helps!

Compared to yellow light, orange light has A. a different polarization.
B. a faster wave velocity.
C. the same frequency.
D. a longer wavelength.

Answers

Orange light always has a longer wavelength than yellow light.
That's how your eye and brain decide that it's orange and not yellow.

2a. Abecomes
jeep starts from it the
starts from it the state of rest. If its
velocity 60m/s and its take 5 minute: what is the accelera
ution of the jeep
the distanced travelled by
the jeep:

Answers

$\bf \underline{ \underline{Given : }}$

Initial velocity,u = 0 m/s

Final velocity,v = 60 m/s

Time taken,t = 5 min = 5 × 60 sec = 300 seconds

$\bf \underline{ \underline{</p><p>To \: be \: calculated : }}$

Calculate the acceleration ( a ) and distance (s ) covered by the jeep.

$\bf \underline{ \underline{Solution : }}$

We will first calculate the acceleration of the jeep.

CASE 1 :

By Using first equation of motion ,

$\sf \: v = u + at$

$\sf \star \: Substituting \: the \: values...$

$\sf\rightarrow \: 60 = 0 + a * 300$

$\sf \rightarrow \: 60 = 300a$

$\sf \rightarrow \: 300a = 60$

$\sf \rightarrow \: a = \cancel (300)/(6)$

$\sf \rightarrow \: a = 50 \: m {s}^( - 2)$

Thus,the acceleration of the jeep is 50 m/s².

Now, Let us calculate the distance travelled by the jeep.

CASE 2 :

By Using third equation of motion ,

$\sf {v}^(2) = {u}^(2) + 2as$

$\sf \star \: Substituting \: the \: values...$

$\sf \rightarrow \: {60}^(2) = {0}^(2) + 2 * 50 * s$

$\sf \rightarrow \: 3600 = 100s$

$\sf \rightarrow \: 100s = 3600$

$\sf \rightarrow \: s = \cancel(3600)/(100)$

$\sf \rightarrow \: s = 36 \: m$

Thus,the distance covered by the jeep is 36 m .

A bicycle rider travels 50.0 km in 2.5 hours. What is the cyclists speed

Answers

Hi,
Recall the formula V=d/t, where V stands for velocity or speed, d stands for distance and t stands for time. By substituting your values you get: V=50.0km/2.5h, which equals to 20km/h.

A block initially at rest on a horizontal, frictionless surface is accelerated by a constant horizontal force of 5 newtons. if 15 joules of work is done on the bock by this force, the kinetic energy of the block increases by

Answers

Answer: The kinetic energy of the block increases by 15 Joules.

Explanation:

Work done is defined as the product of force and displacement of the object.

Mathematically,

$W=F.s$

where,

W =work done

F = force

s = Displacement

Kinetic energy is defined as the energy which is possessed by the virtue of object's motion.

In the question, it is given that work done on block is 15 Joules and we need to find the change in kinetic energy of the block.

We know that,

Work done on the object = Change in kinetic energy of the object

Thus, Kinetic energy is increased by 15 Joules.

The kinetic energy depends on the work done by the applied force. The kinetic energy of the block increases by 15 J.

What is kinetic energy?

The energy possessed by an object by its motion is known as the object's kinetic energy.

Given data-

The magnitude of the constant horizontal force is F = 5 N.

The work done on the block is, W = 15 J.

As per the work-energy theorem, the work done by the applied force is equal to the change in kinetic energy.

Then,

W = ΔKE

Solving as

15 = ΔKE

ΔKE = 15 J

Thus, we can conclude that the block's kinetic energy increases by 15 J.

Learn more about kinetic energy here:

brainly.com/question/999862

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A 1000-kg car is moving along a straight road down a 30∘ slope at a constant speed of 20.0m/s. What is the net force acting on the car?

A rod of mass M = 116 g and length L = 49 cm can rotate about a hinge at its left end and is initially at rest. A putty ball of mass m = 14 g, moving with speed V= 6 m/s, strikes the rod at angle A = 37º a distance D=L/4 from the end and sticks to the rod after the collision. (A) What is the total moment of inertia, 1, with respect to the hinge, of the rod-ball-system after the collision? (B) Enter an expression for the angular speed w of the system immediately after the collision, in terms of m, V, D, 0, (C) Calculate the rotational kinetic energy, in joules, of the system after the collision