Who is the founder of microscope?
Answer:
Zacharias Janssen
Explanation:
Answer:
Zacharias Janssen;
Explanation:
Zacharias Janssen; also Zacharias Jansen or Sacharias Jansen; 1585 – pre-1632 was a Dutch spectacle-maker who lived most of his life in Middelburg. He is associated with the invention of the first optical telescope and/or the first truly compound microscope, but these claims may be fabrications put forward by his son
hope this helps
Based on illustrations of magnetic field lines, where could an object be placed so it would not experience a magnetic force?
halfway between the like poles of two magnets, because the field lines bend away and do not enter this area
halfway between the opposite poles of two magnets, because the field lines are the closest together
above the middle of a bar magnet, because the magnetic field lines are only found around the sides of the magnet
above a pole of a bar magnet, because the magnetic field lines either go in or go out at the end
Answer:
(a) halfway between the like poles of two magnets, because the field lines bend away and do not enter this area
Explanation:
Got it correct on the test.
Answer:
(a) halfway between the like poles of two magnets, because the field lines bend away and do not enter this area
Explanation:
What type of energy do you seen In a windmill
Answer:
mechanical energy is in a windmill
why would hydras avoid reproducing asexually when condition are difficult?
Answer:
I'm soooooooo happy you asked the answer is yes
If a force of 20 N is applied to a mass of 5 kg, what is the acceleration?
Answer:
4 m/s^2
Explanation:
To get the acceleration you are going to use the acceleration formula which is
Acceleration= Force/Mass.
You then do the math which is 20/5, which equals 4
Therefore you get a value of 4. You may be asking what the units are. The units of acceleration are m/s^2 (meters per second squared)
So your final answer is 4 m/s^2
Please, can any one help
Answer:
a = 1.458 [m/s²]
Explanation:
To be able to solve this type of problems it is always advisable to make a free body diagram with the forces acting on the body.
Attached is an image with the free body diagram and the proposed equations, the explanation of obtaining the equations will be described below.
Let's take the movement to the left as positive, i.e. all forces going to the left have a positive sign.
Let's use Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration.
To the left we have the two forces of tension by the cosine of the angle. And to the right the frictional force. The resultant of these forces is equal to the product of the mass (mass of the child plus the mass of the sled), by acceleration.
Put the steps in order to show how crystals are formed
Answer:
A) Formation of ions
B)Formation of ionic bonds
C)Formation of cubes
D)Formation of crystals
Hope this helps
Answer:
1 4 2 3
Explanation:
edge 2021
define the term specific heat capacity of a substance and state its unit
Answer:
Hope this help
Explanation:
Specific heat capacity,c of a substance is the quantity of heat needed to raise the temperature of 1 kg mass of the substance by 1°C
Unit for c is J/kg/°C or J/kg/K
If a car travels 10 km north and then 10 km west, what is the MAGNITUDE of
displacement?
Answer:
The magnitude of the displacement is [tex]H = 14.14 \ km[/tex]
Explanation:
From the question we are told that
The distance of the car to north is d = 10 km
The distance of car to the west is w = - 10 \ km
The negative sign is because the direction is west
Generally applying Pythagoras theorem , the displacement is
[tex]H = \sqrt{d^2 + w^2}[/tex]
=> [tex]H = \sqrt{(10)^2 + (-10)^2}[/tex]
=> [tex]H = 14.14 \ km[/tex]
If the force being applied to an object is doubled, what will happen to its
acceleration?
Answer:
Acceleration decreases.
Explanation:
Hope this helps you.
A lithium atom has 3 protons, 4 neutrons and 3 electrons. How would the atom change to become a cation? How would the atom change to become an anion?
Answer:
- For the lithium ion to change to become an anion, it will have to gain one or more electrons which can be pulled away from possibly other atoms with a weaker affinity for them.
- For the lithium ion to change to become a cation, it will have to loose one or more electrons which can be drawn by other atoms with a stronger affinity for them.
Explanation:
Generally, an anion has a net negative charge arising from the fact that it has more electrons than protons while a cation has a net positive charge arising from the fact that it has more protons than electrons.
Now, for the lithium ion to change to an anion, it means it has to have more electrons than it's protons. Thus, since it has 3 number each of protons and electrons, it will have to gain one or more electrons which can be pulled away from possibly other atoms with a weaker affinity for them.
Now, for the lithium ion to change to a cation, it means it has to have more protons than it's electrons. Thus, since it has 3 number each of protons and electrons, it will have to loose one or more electrons which can be drawn out by possibly other atoms with a stronger affinity for them.
Using our knowledge of physics... If we know that the moving man travels 10 meters, has an initial velocity of 0 m/s and an acceleration of 1 m/s, use the equation d = vi t + 1/2 a t^2 to solve for time.
Answer:
t= 4.5s
Explanation:
vi=0m/s
a= 1m/s
d=10m
10m= 0(t) + 1/2(1m/s)(t^2). 0xt cancels out, 1/2 of 1= .5
10m= .5m/s(t^2) Divide both sides by .5
20m= t^2. Take square root of each side
Square root of 20 is 4.472135954999579
sig figs, t= 4.5 s
A bullet is fired at an angle of 45°. Neglecting air resistance, what is the direction of acceleration during the flight of the bullet?
a) upward
b) downward
c) dependent on the initial velocity
d) at a 45 angle
Answer:
b) downward. Correct choice
Explanation:
Projectile Motion
It's known as the type of motion that experiences an object that is projected near the Earth's surface and moves along a curved path exclusively under the action of gravity.
The gravity manifests through the acceleration of gravity g whose value is [tex]9.8 m/s^2[/tex] and points downward. The object will eventually fall to the ground at a time and speed which depends on the initial speed and launch angle.
When the bullet is fired regardless of the initial speed and angle, the only acceleration of the system is g, thus:
b) downward. Correct choice
The acceleration acts on the bullet will be the acceleration due to gravity that is g and has a downward direction.
What will be the direction of the acceleration of Bullet fired?Since the bullet is fired at an angle of 45 so the bullet will travel in a projectile. So every point in time the acceleration due to gravity will act on the bullet.
After some point in time, the bullet will come to the surface of the earth as the energy in the bullet will reduce.
As we know that anything present on the earth is under the influence of the earth's gravity.
So the fired bullet will experience acceleration due to the gravity of the earth and the direction of the acceleration will always be downwards.
So the bullet will eventually fall to the ground at a time and speed which depends on the initial speed and launch angle.
Thus the acceleration acts on the bullet will be the acceleration due to gravity that is g and has a downward direction.
To know more about the Projectile motion follow
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I need help ASAP this is due tomorrow at 8 AM its four questions and I don't understand none of them please help!!
1. Draw a series circuit with a 2-cell battery, 2 motors and an open switch.
2. Draw a parallel circuit with a 3-cell battery, 4 lamps and 1 closed switch that turns off all lamps.
3. Draw a circuit with a 3-cell battery, 2 motors (one motor on and one off).
4. Draw a circuit with a 2-cell battery, 2 lamps, 1 closed switch (wire it so if one lamp burns out, both lamps will not work).
Answer:
Is it a test
Explanation:
Calculate the kinetic energy of a truck that has a mass of 2900 kg and is moving at 55 m/s.
Answer:
2900 divided by 55 is 52.727272727272727
what is Newton's second law?
F=mXa
a=F/m
m=F/a
All of the above
It should be the first one, F= mXa (F = m times a).
Newton's second law of motion is also known as
a) quantitative law of motion
b) quantitative law of force
c) qualitative law of motion
d) qualitative law of force
Answer:
Newton's second law of motion is quantitative law of force . Newton's first law of motion is qualitative law of force.
A biker starts moving from rest with a constant acceleration of 2.0 m/s^2. What is his velocity after 5.0 s?
a = v-u/t
2 = v - 0 / 5
2 = v/5
v = 10 m /s
You travel 50 meters at an angle of 37° North of East.
a) Calculate the Horizontal component.
Answer:
a) x = 39.9 m
Explanation:
To find the components of a vector we can use trigonometric relationships. Since they indicate that the angle is 37º north of east, this angle is measured counterclockwise from the x-axis, therefore using trigonometry.
cos θ = x / d
sin θ = y / d
where the angle is 37º and the distance d = 50 m
x = d cos θ
y = d sim θ
let's calculate
x = 50 cos 37
y = 50 sin 37
x = 39.9 m
y = 30.1 m
When a gas increase in thermal energy it will go through...?
A. thermal contraction
B. thermal expansion
C. freeze
D. smell
Answer:
b
Explanation:
Which statement best describes how waves carry energy?
O Energy moves from one place to another through the wave.
O Energy increases as it moves through the wave.
Energy is completely consumed by the beginning of the wave.
Energy builds through the wave and is released at the end.
Ο Ο
Answer:
Energy moves from one place to another through the wave. answer A
A wave is a disturbance that transmit energy. Thus, the correct statement is energy moves from one place to another through the wave.
What is a wave?A wave is a disturbance that transfers energy as it moves from one point to another.
Different terminologies are used to characterise a wave as it travels. Some of these include
Wave speed Wave crest Wave Frequency Wave Period Wavelength Wave troughAmplitude etcConsidering the question given above, we see clearly from the definition of wave that the energy is transferred as the wave is moving.
Thus, we can conclude that the correct answer to the question is energy moves from one place to another through the wave
Learn more about wave:
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You toss an apple across the room to a friend. Which of the following
statements is true about the apple at the top of its trajectory?
I believe the answer is C, but im not sure.
Explanation:
Answer:
its vertical component of its velocity is zero
Explanation:
A wolf can reach speeds of (16.5 m/s) in just 2 seconds. What is the wolf's acceleration?
Answer:
8.25Explanation:
Speed = 16.5 m/s
Time = 2 seconds
Acceleration = Speed/time
[tex]Acceleration = \frac{16.5}{2} \\\\Acceleration =8.25[/tex]
A boat sends a sound to the bottom of the ocean and it takes 3 seconds to return to the boat. How deep in the ocean? The speed of sound on water is 1500m/s.
Answer:
2,250 meters deep
Explanation:
If the time taken for the the signal to return to the boat means that it took 3 seconds for the signal to travel to and from the floor the same distance. That means it took 1.5 seconds to travel to the floor at a speed of 1500m/s means that it is 1500 multiplied by 1.5 to a distance of 2,250m. (Derived from the speed = distance divided by time formula to distance = speed multipled by time)
Why do you think history is often referred to as social science
Answer:
History is considered to be a hybrid of the humanities and social sciences. This is because it uses the tools and methods of both.
What unit is force always in?
Pounds
Kilograms
Meters
Newtons
The answer would be newtons.
10. A force of 24 N was required to accelerate an object at a rate of 4 m/s-. What was the object's mass?
11It look 2.3 seconds for a car's velocity to change from 20 m/s to 35 m/s. The mass of the car was 1370 kg. What force was required to cause the acceleration? (Hint: First calculate the acceleration.)
Answer:
?
Explanation:?
When are island-arc volcanoes formed?
Answer:
Its the result from subduction of an oceanic tectonic plate when its under another tectonic plate. Sometimes parallel the oceanic trench. Also if a volcano is offshore, it forms islands, which will result in a volcanic type of island arc.
Explanation:
Hope this helps! If this wasn't the answer you were looking for, please don't hesitate to comment here or private message me. Also if you have any other questions concerning something you don't know or want to learn about, also private message me or comment here! Have a nice day/night!! :))
The Tacoma narrows bridge collapsed due to?
A. Refraction
B. Reflection
C. Diffraction
D. Resonance
Answer:
i think its resonance but if im wrong its my fault
Explanation:
Pete is driving down 7th street. He drives 550 meters in 8 seconds. Assuming he does not
speed up or slow down, what is his speed in meters per second
Answer:
Speed = 68.75m/s
Explanation:
Speed can be defined as distance covered per unit time. Speed is a scalar quantity and as such it has magnitude but no direction.
Mathematically, speed is given by the equation;
[tex]Speed = \frac{distance}{time}[/tex]
[tex]S = \frac{d}{t}[/tex]
Given the following data;
Distance = 550m
Time = 8secs
Substituting into the above equation;
[tex]S = \frac{550}{8}[/tex]
Speed, S = 68.75m/s