The crate only moves horizontally, so its net vertical force is 0. The only forces acting in the vertical direction are the crate's weight (pointing downward) and the normal force of the surface on the crate (pointing upward). By Newton's second law, we have
∑ F (vertical) = n - mg = 0 → n = mg = 1876 N
where n is the magnitude of the normal force.
In the horizontal direction, the crate is moving at a constant speed and thus with no acceleration, so it's completely in equilibrium and the net horizontal force is also 0. The only forces acting on it in this direction are the 747 N push (pointing in the direction of the crate's motion) and the kinetic friction opposing it (pointing in the opposite direction). By Newton's second law,
∑ F (horizontal) = 747 N - f = 0 → f = 747 N
The frictional force is proportional to the normal force by a factor of the coefficient of kinetic friction, µ, such that
f = µn → µ = f / n = (747 N) / (1876 N) ≈ 0.398188 ≈ 0.40
How much kinetic energy does 150kg boulder have if it is rolling down a hill with a speed of 5m/s? (KE = 1/2mv2) 375J 310J 1875J 1500J
Answer:
1875J
Explanation:
KE = 1/2mv2
=0.5 × 150kg × 5m/s^2
= 1875J
Therefore, the kinetic energy of the boulder is 1875J.
What could you do to increase the electric potential energy between two negatively charged particles by a factor of 16?
Answer:
Increase the charge of one particle by a factor of 16
Explanation:
Thermal equilibrium is when objects are not at equal temperature
True or false
Answer:
false
Explanation:
equilibrium means equal
therefore thermal equilibrium means when objects are at equal temperature
PLS ANSWER FAST WILL GIVE BRAINLEST!!!!!!!!!
what is the relationship between speed and kinetic energy? (In other words, how are the two related to one another?) Explain.
Answer:
The kinetic energy of an object is directly proportional to the square of its speed. That means that for a twofold increase in speed, the kinetic energy will increase by a factor of four.
Found it on the internet
Explanation:
Hope this helps dude
What is the mass of a baseball with a velocity of 30 m/s and a momentum of 6 kg•m/s?
Answer:
0.2 m/s
Explanation:
Momentum= mass x velocity
6 kg/m/s divided by 30 m/s= 0.2 m/s
Which of the following is NOT considered an invasion game or sport?
A. Lacrosse
b. Golf
c. Football
D.
Capture the Flag
Answer:
Golf
Explanation:
Golf is NOT considered an invasion game or sport
What is the velocity of an 80 kg person skating across the ice with a kinetic energy of 16, 000 joules?
Answer:
V = 20 m/s
Explanation:
Given the following data;
Mass = 80kg
Kinetic energy = 16,000 joules
To find the velocity;
Kinetic energy can be defined as an energy possessed by an object or body due to its motion.
Mathematically, kinetic energy is given by the formula;
[tex] K.E = \frac{1}{2}MV^{2}[/tex]
Where;
K.E represents kinetic energy measured in Joules.
M represents mass measured in kilograms.
V represents velocity measured in metres per seconds square.
Substituting into the formula, we have;
16000 = ½*80*V²
16000 = 40V²
V² = 16000/40
V² = 400
Taking the square root of both sides, we have;
V = 20 m/s
The linear expansivity of a metal p Is twice that of metal q. When these metals are heated through the same temperature, their increase in length is the same. Calculate the ratio of the original length of p to that of q
Answer:0-------0
do we have options?
Explanation:
If the wheel then slows to rest in 9.46 s while making a quarter turn, calculate the magnitude of its average angular speed during that time.
Answer:
0.16 rad /s
Explanation:
Given that :
Time, t = 9.46 s
Quarter turn = 1/4 rev
θ = wt
w = angular speed `. ; t = time in second
1 rev = 2 pi
θ = 2pi
1/4 θ = 1/4 * 2pi = pi/2
θ = wt
pi/2 = w * 9.62
3.14 = w * 9.62 * 2
3.14 = 19.24w
w = 3.14 / 19.24
w = 0.1602040
w = 0.16 rad /s
A laser produces light at 5.32x10-7 m.
What is the frequency of the light?
A. 1.77x10-6 Hz
B. 1.60x1011 Hz
C. 1.88x107 Hz
D. 5.64x1014 Hz
Answer:
D
Explanation:
speed = frequency x wavelength
speed of light in vacuum is 3.0 x 10^8
wavelength = 5.32 x10 ^-7
3.0 x 10 ^ 8 = 5.32 x 10^-7 x frequency
frequency = 5.63909 x 10^14
round it off = 5.64 x 10^14 Hz
thus the answer is D
hope this helps please mark it
does a wall or door have more inertia?
Answer:
door
Explanation:
What type of motion does this graph represent?
To calculate the frequency of a electro magnetic wave what do you need?
plzzzz mark me brainliest if it helps you
Car A has a mass of 2000 kg and is going 28 m/s east.
Car B has a mass of 4000 kg and is going 13 m/s west.
What will be the momentum of both cars together after the collision?
10 turns of wire are closely wound around a pencil as shown in the figure. when measured using a scale as shown, the length of total turns is obtained 25mm. then a) What is the thickness of the wire? b) Express the thickness of the wire in centimetre.
please write correct answer
Answer:
A. 2.5 mm
B. 0.25 cm
Explanation:
A. Determination of the thickness of the wire.
Number of turns (n) = 10 turns
Length (L) = 25 mm
Thickness (T) =?
T = L / n
T = 25 / 10
T = 2.5 mm
Thus, the thickness of the wire is 2.5 mm
B. Determination of the thinkness in centimetres (cm).
Thickness (in mm) = 2.5 mm
Thickness (in cm) =?
Recall:
10 mm = 1 cm
Therefore,
2.5 mm = 2.5 mm × 1 cm / 10 mm
2.5 mm = 0.25 m
Therefore, the thickness of the wire in centimetre (cm) is 0.25 cm
For normal weight students, regular physical activity is unnecessary." True O False
Answer:
The answer is False
Explanation:
to keep the body active and going in the good state
Answer:
False ....Even for a normal student , in order to maintain the fitness they should exersice ...
(b) Figure 4 shows a car travelling on a motorway.
A passenger wants to check the accuracy of the speedometer of the car.
The car is travelling at a constant speed.
The passenger has a stopwatch.
The lamp posts are 40 m apart.
lamp post
Figure 4
Describe how the passenger could determine the speed of the car as accurately
as possible.
(3)
Answer:
To calculate anything - speed, acceleration, all that - we need data. The more data we have, and the more accurate that data is, the more accurate our calculations will be. To collect that data, we need to measure it somehow. To measure anything, we need tools and a method. Speed is a measure of distance over time, so we'll need tools for measuring time and distance, and a method for measuring each.
Conveniently, the lamp posts in this problem are equally spaced, and we can treat that spacing as our measuring stick. To measure speed, we'll need to bring time in somehow too, and that's where the stopwatch comes in. A good method might go like this:
Press start on the stopwatch right as you pass a lamp postEach time you pass another lamp post, press the lap button on the stopwatchPress stop after however many lamp posts you'd like, making sure to hit stop right as you pass the last lamp postRecord your dataCalculate the time intervals for passing each lamp post using the lap dataCalculate the average of all those invervals and divide by 40 m - this will give you an approximate average speedOf course, you'll never find an *exact* amount, but the more data points you have, the better your approximation will become.
when you apply 1.5 V across unknown ohmic resistor you observe current of 1.5 mA. You expect to observe current of _____ mA when you apply 3 V across the same resistor.
0.3 mA
3 m A
30 mA
300 mA
Other:
Answer:
answer is 3mA
Explanation:
since V=IR
and 1.5v=1.5mA x 1ohms
definitely
it's gonna be directly proportional
means 3v=3mA
What is the “water cycle?”
Answer:
uhm
Explanation:
the water cycle describes the continuous moving of water on earth with steps called evaporation condensation precipitation the other one
Answer:
The water cycle consists of Evaporation, Convection, Precipitation and Collection :3
Explanation:
:3
plssss helpppp it’s urgent
What gravitational acceleration does an object experience at the instant it is released at
one Earth radius above the surface of the Earth?
A) 1.3 m/s^2
B) 2.45 m/s^2
C) 4.90 m/s^2
D) 9.7 m/s^2
Answer:
B) 2.45 m/s^2 ( not sure i just search it )
a bomb is dropped from a plane fying at a constant horizontal velocity at an altitude of 300m. where is the bomb after 2 seconds?
Answer:
it will be almost on the ground
Explanation:
i say this because the boom is heavy and its going down fast so it will not be in the air or on the floor it will be akmost o the ground.
It's almost always difficult to select healthy foods at a fast-food restaurant. O True O False
Answer:
yesExplanation:
because its most likely to have chucks than heathy foodWhat is the acceleration of a bike that starts from rest and after 10s is traveling 20m/s?
Answer:
10meter per second square
Explanation:
since the bike is from rest, the initial velocity is zero and the final velocity is 20m/s . so by formula a=v-u/t
a = 20-0/10
a = 2
Does gravity affect kenetic energy
Answer:
Yep.
Explanation:
In physics, the kinetic energy of an object is the energy that it possesses due to its motion. Gravity will pull the object down. So yes, gravity affects kinetic energy.
Answer:
Kinetic energy is energy an object has because of its motion. A ball held in the air, for example, has gravitational potential energy. If released, as the ball moves faster and faster toward the ground, the force of gravity will transfer the potential energy to kinetic energy.
Explanation:
several Non-Examples of mechanical weathering are?
Answer:
The removal of rock particles by wind, water, ice, or gravity,mining, carving, carving
Explanation:
#3
The speed of sound is 346 m/s. If a sound wave travels at a frequency of 55 Hz, what would its wavelength be?
#4
If the same wave in question #3 travels through water with the same wavelength, at what frequency will it be traveling? (speed of sound in water = 350 m/s)
Answer:
The first one is 6.3m or 6.25m
The second is 60 m/s
Explanation:
-7 and a number 12 units to the rights of -7
Answer:
5
Explanation:
Move 12 spots to the right from -7 on the number line.
The form of energy commonly called light is transferred by
_____ waves
Answer:
it would be electromagnetic waves
Water uptake to the atmosphere occurs through the processes of evaporation and transpiration from plants where it condenses to form clouds. Clouds release the water through precipitation. During a summer of extreme drought, what can we expect to happen to the surface groundwater stored in ponds and lakes?
a. Water levels will increase because there is more precipitation
b. Animals won't drink as much to save water, so water levels remain the same
c. Water levels will increase because there are more evaporation and transpiration
d. Water levels will decrease because there are more evaporation and transpiration
water level will decrease because there are more evaporation and transpiration
