Which component measures the potential difference across a branch in a circuit? A.switch. B.resistor. C.ammeter. D.voltmeter.
Answer: The correct answer is option (D).
Voltmeter is a device which measures the the voltage applied across the circuit. It is an electrical instrument used to measure the electric potential between the two points in an electric circuit.
A switch is the device which used to connect or disconnect the circuit.
Resistor is a device which opposes the flow of current is an electric circuit.
An ammeter the is an electrical device which measures the amount of current in flowing in amperes in an electrical circuit
Hence,the correct answer is option (D).
Can we see different colors but think we can see the same colors as another person?
"They claim it's entirely possible that two people can look at the same object and have the same wavelengths hit their eyes, yet “see" different colors! ... Most people have three different photoreceptors in the backs of their eyes that perceive red, green and blue."
hope this helps
Some people see different colors than others do.
An object has a mass of 1kg on Earth. What is its weight on the moon?
The weight on moon will be 166.66 grams.
We have a object on earth.
We have to identify its weight on moon.What is weight ?
Weight is a force acting on the body directed towards the center of earth and is the product of mass and acceleration due to gravity.
W = mg
According to the question -
Mass on earth = 1 Kg = 1000 grams
Now, the weight on moon is 1/6 of that of weight on earth. Therefore -
W(M) = W(E)
W(M) = x 1000 = 166.66 grams
Hence, the weight on moon will be 166.66 grams.
To solve more questions on Mass and weight, visit the link below-
the Mass of 1 kg object is same in Earth & Moon.
Weight, on the otherhand does change with location depends on the gravity. so the answer is : Weight of one kilo on the surface of moon is 1.622 N. A body is taken from the center of the Earth to the Moon.
Looking at the same nonmetal group on the periodic table, how does the reactivity of an element in period 2 compare to the reactivity of an element in period 4? The period 2 element would be more reactive because the attractive force of protons is stronger when there are fewer neutrons interfering. The period 2 element would be more reactive because the attractive force of protons is stronger when electrons are attracted to a closer electron shell. The period 4 element would be more reactive because the attractive force of protons is stronger when there are more neutrons helping. The period 4 element would be more reactive because the attractive force of protons is stronger when electrons are attracted to a farther electron shell.
B. The period 2 element would be more reactive because the attractive force of protons is stronger when electrons are attracted to a closer electron shell.
took the test (:
You go to an amusement park with your friend Betty, who wants to ride the 70-m-diameter Ferris wheel. She starts the ride at the lowest point of a wheel that, as you face it, rotates counterclockwise. Part AWhat is the magnitude of her displacement vector when the wheel has rotated by an angle of 40 ∘?Express your answer with the appropriate units.Part BWhat is the direction of her displacement vector when the wheel has rotated by an angle of 40 ∘, measured counterclockwise from the horizontal?
As we know that initially the position vector is r
then the same magnitude position vector is rotated by 40 degree angle
so displacement magnitude is the magnitude of change in position vector
so it is given as
now we need to find the direction of the displacement vector
so let say it makes an angle with x axis so we have
Many scientists do not believe in astrology because
You are driving at the speed of 27.7 m/s (61.9764 mph) when suddenly the car in front of you (previously traveling at the same speed) brakes and begins to slow down with the largest deceleration possible without skidding. Considering an average human reaction, you press your brakes 0.543 s later. You also brake and decelerate as rapidly as possible without skidding. Assume that the coefficient of static friction is 0.804 between both cars’ wheels and the road. Calculate the acceleration of the car in front
of you when it brakes.
Calculate the braking distance for the car in
front of you.
Find the minimum safe distance at which you
can follow the car in front of you and avoid
hitting it (in the case of emergency braking
1) Acceleration of the car in front: -7.89 m/s^2
The only data we need for this part of the problem is:
--> initial velocity of the car
--> coefficient of friction between the car wheels and the road
From the coefficient of friction, we can find the deceleration of the car. In fact, the force of friction is given by
where m is the car's mass and is the acceleration due to gravity. We can find the car's acceleration by using Newton's second law:
And the negative sign means it is a deceleration.
2) Braking distance for the car in front: 48.6 m
This can be found by using the following SUVAT equation:
v=0 is the final velocity of the car
u=27.7 m/s is the initial velocity of the car
a=-7.89 m/s^2 is the acceleration of the car
S is the braking distance
By re-arranging the formula, we find S:
3) Minimum safe distance at which you can follow the car: 15.0 m
In this case, we must calculate the thinking distance, which is the distance you travel before hitting the brakes. During this time, the speed of your car is constant, so the thinking distance is given by
After hitting the brakes, your car decelerates at the same rate of the car in front of you, so the braking distance is the same of the other car:
So the total distance your car covers is
At the same time, the car in front of you just covered a distance of 48.6 m. So, in order to avoid the collision, you should travel at a distance equal to
Describe three forces that are acting in the situation described below A factory worker carries a box of nails. His shoe slips on a patch of oil on the ground, and he drops the box. The box opens, and the nails all fall to the floor. He uses a powerful magnet to collect all of them and cleans up the oil so no one else slips in it.
1) Force of gravity or weight
2) Friction force
3) Magnetic force
A factory worker is carrying box of nails.
So in this situation of carrying box of nails the worker must applied a force to pull the box against the force of gravity on it. This force is equal to the weight of the nails.
Also for walking on the floor there must be force of friction between his shoes and the floor.
As the friction force becomes very small due to oil drop on floor his shoes slips on the floor and he fell down
Next he used a powerful magnet to collect the nails which falls on the floor so here he used magnetic force to pull all the nails.
Carries a box: tension in worker's arms
Nails fall: force of gravity
Magnet: magnetic force.
It is 5.5 km from your home to the physics lab. As part of your physical fitness program, you could run that distance at 10 km/h (which uses up energy at the rate of 700 W), or you could walk it leisurely at 3.0 km/h (which uses energy at 290 W). Part A. Which choice would burn up more energy?
Part B. How much energy (in joules) would it burn?
Part C. Why is it that the more intense exercise actually burns up less energy than the less intense one?
Displacement = 5 km
Converting km/h to m/s,
10 km/h * 1000 m/1 km * 1 h/3600 s
= 25/9 m/s
700 watt = 700 J/s
Velocity = displacement/time
Time = 5000/(25/9)
= 1800 s
Energy = power * time
= 700 * 1800
= 1260 kJ
Converting km/h to m/s,
3 km/h * 1000 m/1 km * 1 h/3600 s
= 5/6 m/s
290 watt = 290 J/s
Velocity = displacement/time
Time = 5000/(5/6)
= 6000 s
Energy = power * time
= 290 * 6000
= 1740 kJ
Walking burns more energy; 1,740,000 joules. It burns more because you walk for a greater period of time.