you do no know an objects velocity until you know its _____.
14. Saeed is pulling a 6 kg heavy rock with an upward force of 40 N but does not succeed to lift it up. What is the magnitude of the normal force on the rock?
Answer:
58.8 N
Explanation:
The normal force is calculated as equal to the perpendicular component of the gravitational force.
Thus; N = mg
We are given m = 6 kg
Thus;
N = 6 × 9.8
N = 58.8 N
Thus, magnitude of normal force on the rock = 58.8 N
When people place a metal saucepan on the heating element of a stove, heat is transferred from the element to the saucepan by: A reflection.
B convection.
C conduction.
D radiation.
A mass sitting on a horizontal, frictional surface is attached to one end of a spring; the other end is fixed to a wall. 3.0 J of
work is required to compress the spring by 0.20 m. If the mass is released from rest with the spring compressed, it
compresses a maximum acceleration of 15 m/s?.
a) Determine the spring constant.
b) Determine the mass.
d) What is the velocity when the mass reaches maximum acceleration?
c) Deterinine the net force when the mass passes 0.10m compression
d) Determine the acceleration when the mass passes 0.10m compression.
e) Determine the velocity when the mass passes 0.10m compression
Answer:
I started answering this before everything was erases, but briefly
W = 1/2 K x^2 so K = 2 W / x^2 = 6 * 25 = 150
Also F = - K X = 150 * 1/5 = 30 N at max extension
m = F / a = 30 /15 = 2 kg
Since max extension occurs at t = 0 you can write
x = A sin ω t
v = ω A cos ω t
a = -ω^2 A sin ω t note that there is no phase angle here
Also at .1 compression
.1 = .2 sin ω t and sin ω t = 1/2 and ω t = 30 deg = pi / 6
Substiture these values above to get velocity and acceleration when
ω t = 30 deg
Listed in the Item Bank are individual steps that need to be ordered. To find out more information about steps, some have more details
available when you click on them. Drag and drop the steps in the proper order by placing each in its corresponding open rectangle. Be sure
that the earliest step is placed next to the number 1.
Answer:
radio
microwave
Infrared
Visible
Ultraviolet
X-ray
Gamma ray
I hope this helps you a little bit
A box of mass 5.0 kg is initially at rest. A 500 N force causes it to move horizontally through a
distance of 12.00 m. How much work would there be?
Answer:
Workdone = 6000Nm
Explanation:
Given the following data;
Mass = 5kg
Force = 500N
Distance = 12m
To find the work done;
Workdone = force * distance
Workdone = 500 * 12
Workdone = 6000Nm
what do fast-twitch and slow-twitch muscle fibers share in common
Answer:
Explanation:Slow-twitch muscle fibers support long distance endurance activities like marathon running, while fast-twitch muscle fibers support quick, powerful movements such as sprinting or weightlifting.
A billiard ball rolls from rest down a smooth ramp that is 8.0 m long. the acceleration of the ball is constant at 2.0?
Gravitational potential energy (1) - masss (kg) x gravitational field strength (N/kg) x height (m)
1. Calculate the gravitational potential energy of the following masses on top of Trump tower which has a mass
of 202 m (g= 9.81 N/kg)
a) 100 kg
b) 90 kg
c) 45 kg
d) 58 kg
e) 1g
1) 1000 g
h) 1998
1) 1.5 kg
g) 100 g
[tex]\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the Concept of the Potential Energy.
Here lets calculate it one by one ;-
1.) P = mgh ==> 100*9.81*202===> 198162 Joules
2.) P = mgh ==> 90*9.81*202 ==> 178345.8 Joules
3.) P = mgh ===> 45*9.81*202 ===> 89172.9 Joules
4.) P = mgh ===> 58*9.81*202 ===> 114933.96 Joules
5.) P = mgh ===> 0.001*9.81*202 ===> 1.981 Joules
6.) P = mgh ===> 1.00*9.81*202 ===> 1981.62 Joules
7.) P = mgh ===> 1.998*9.81*202 ==> 3959.27 Joules
8.) P = mgh ===> 1.5*9.81*202 ===> 2971.43 Joules
9.) P = mgh ===> 0.1*9.81*202 ===> 198.162 Joules.
Above we calculated the potential energy for every mass given above.
As time goes on, the ENTROPY in a closed system should increase. This is because of which Law?
A) Conservation of Energy
B) Conservation of Momentum
C) 1st Law of Thermodynamics
D) 2nd Law of Thermodynamics
E) None of these
Answer:
The answer is D
The second law of thermodynamics
Which pair of moving pulses in a rope will produce
destructive interference?
what is the gravitational potential energy when a bungee jumper
of 80 kg is lifted 60 m in a crane before jumping?
Which of these is not a standard unit?
a. second
b. metre
c. hand span
d. gram
Answer: Hand span
Explanation: Hand span is not a standard unit.
Second is the unit of time.
Meter is the unit of length or distance covered by an object.
Gram is the unit of weight of an object.
Hand span is not a standard unit. This is because the size of hand varies from person to person. Hence, the correct option is (c) "hand span".
HELP!! AM I CORRECT?? PLS TELL ME, IF U ANSWER PROPERLY I'LL GIVE U BRAINLIEST!!
Answer:ur right I think
Explanation:
Answer:
HON, i'm going to be honest, i'm not sure but it sounds like it is the Universal Expansion from what I learned about space
I'm sure this helps but if it doesn't DON'T GIVE ME BRAINLIEST, if it does then do
rock at the edge of a cliff has kinetic energy because of its position.
True
False
its false rock is at edge
Please physics brainlist !
29. A wave source approaches your location, describe
the shift in wavelength and frequency you will
perceive.
Answer:
The waves travel at the same speed, but the observed frequency depends on any relative motion between the observer and source. When the observed frequency changes, so does the wavelength. If the observer and source are moving toward each other, then the frequency increases and the wavelength decreases.
Motion maps for two objects, Y and Z, are shown.
Y →
Z
x
How many seconds does Object Z start before Object Y?
2.
03
04
5
Answer:
i can't see the map plzz send the map
Answer:
its 3
Explanation:
I just took test
last question, can someone help please?
An automobile of mass 1.46 E3 kg rounds a curve of radius 25.0 m with a velocity of 15.0 m/s. The
centripetal force exerted on the automobile while rounding the curve is:
Answer:
Centripetal force = 13140 Newton.
Explanation:
Given the following data;
Mass = 1.46 E3 kg = 1.46*10³ = 1460 kg
Velocity = 15m/s
Radius, r = 25m
To find the centripetal force, we would use the following formula:
Centripetal force = mv²/r
Substituting into the equation, we have;
Centripetal force = (1460*15²)/25
Centripetal force = (1460 * 225)/25
Centripetal force = 328500/25
Centripetal force = 13140 Newton.
The kinetic energy of a body moving at a speed of 10 m / s is equal to 1000 J. What is the body mass
Answer:
m = 20 kg
Explanation:
Given that,
The speed of a body, v = 10 m/s
Kinetic energy of the body, K = 1000 J
We need to find the mass of the body. The formula for the kinetic energy of a body is given by :
[tex]K=\dfrac{1}{2}mv^2\\\\m=\dfrac{2K}{v^2}\\\\m=\dfrac{2\times 1000}{(10)^2}\\\\m=20\ kg[/tex]
So, the mass of the body is equal to 20 kg.
Calculating net force
Answer:
0N.
Explanation:
Net force is the sum total of forces acting on an object.
The Fn which is the net force is
450+ (-250) + (-600)+ 600+ 0 + 250 + (-450)
= 450-250+(-600)+ 600+0+250-450
= 0N
The net force is 0
I’m a god, a planet, and I measure heat. What am I?
mercury??????? my only guess
Mercury is that it?
Explain why a charged body loses its charge if we touch it with our hand?
if u answer me I can give u brainliest ☺️
Answer:
Explanation: A charged body loses its charge when we touch it with our hand because some of the charge flows through our body to the ground earthing. As a result the charge on the body decreases every time we touch it. This is because of earthing.
Explanation:
yw .
Explanation:
When we touch a charged body, it loses its charge, due to the process of earthing. Our body is a good conductor of electricity. It transfers the charges to the earth
Empujamos un baúl 3 metros, para ello aplicamos una fuerza de 200 Newton. ¿Cuál es el trabajo realizado?
Answer:
Trabajo realizado = 600 Nm
Explanation:
Dados los siguientes datos;
Fuerza = 200 Newton
Distancia = 3 metros
Para encontrar el trabajo realizado; Trabajo realizado = fuerza * distancia
Sustituyendo en la ecuación, tenemos; Trabajo realizado = 200 * 3
Trabajo realizado = 600 Nm
A 24 kg object, initially moving at 20 m/s, is slowed by an applied force of 20 N to a final velocity of 16 m/s. How much time did this take?
Answer:
Explanation:
Turtle ba lls
Answer:
4.8 seconds
Explanation:
Ft=change in momentum
Initial momentum=mv=24*20=480 kg*m/s
new momentum=mv=24*16=384 kg*m/s
change in momentum=96 kg*m/s
Ft=change in momentum
20(t)=96
t=4.8 seconds!
PLEASE HELP ASAP!!!
GIVING BRAINLIEST!!!
40 points!!
Answer:
According to me Option is the right answer
A. 8,400 J
PLS HELP!! I will make brainliest!!
Which process is an example of a chemical reaction?
a. an iron nail rusting
b. bath water cooling while you take a bath
c. a piece of metal being heated until it expands
d. a glass window breaking when hit with a baseball
Answer:
Rusting!
Explanation:
Rusting is a chemical reaction because it is the process of oxidation of a metal.
Answer:
rusting
Explanation:
Which of these statements is true about the effect of a force exerted upon an object?
a. A large force always produces a large change in the object's momentum.
b. A small force always produces a large change in the object's momentum.
c. A small force applied over a long time interval can produce a large change in the object's momentum.
d. A large force produces a large change in the object's momentum only if the force is applied over a very short time interval.
Answer:
d. A large force produces a large change in the object’s momentum only if the force is applied over a very short time interval.
Explanation:
Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.
Mathematically, momentum is given by the formula;
[tex] Momentum = mass * velocity [/tex]
Also, the impulse of an object is given by the formula;
[tex] Impulse = force * time [/tex]
In accordance with the impulse-momentum theorem, the statement which is true about the effect of a force exerted upon an object is that a large force produces a large change in the object’s momentum only if the force is applied over a very short time interval.
How the choice of building materials and techniques can help them cool down faster, after heating up.
Answer:
The choice of building materials and techniques can help them cool down faster, after heating up is explained below in brief details.
Explanation:
Building materials
Buildings that are composed of rock, bricks, or pavement, or inserted into the territory, can seem cooler thanks to the great "thermal mass" of these elements – that is, their capability to assimilate and discharge heat gently, thereby softening temperatures over time, producing daytime cooler and night-time warmer.
b. What is the man's weight on Mars where the acceleration due to gravity is
3.7 m/s2 ? Show your answer in both Newtons and pounds.
Answer:
How much is the mass of man?