i dont know
Explanation:
A football is thrown with an acceleration of 15 m/s^2 and a force of 13 N. What is its mass?
A.150 kg
B. 0.87 kg
C. 2.0 x 105 kg
D. 0.12 kg
to start something moving, a push force must be ______ than resisting forces such a friction. what word complets the gap?
Answer:
To start something moving, a push force must be greater than resisting forces such a friction.
Explanation:
The force of resistance, for example friction, slows things down, so the push force must be greater in order to increase the speed or to start something moving.
An object has a mass of 10 kilograms and is accelerating at 5 m/s/s, what force pushed the object?
Answer:
force pushed the object = 10 × 5 = 50N
ANSWER ASAP!!!!!
Chemotherapy is used to treat many types of cancer. A researcher discovers that modifying treatment by
altering the dosage of a group of drugs and incorporating radiation therapy increases the effectiveness
in treating a particular type of cancer.
Read the information above. How should the researcher proceed?
A. He should request an interview with a representative from a major newspaper.
B. He should keep his findings secret to prevent them from being misused.
C. He should report his findings to a reputable science journal.
D. He should encourage doctors nationwide to use the new course of treatment.
Answer:
He should report his findings to a reputable science journal.
Which of the following most directly shows how physics affects society?
A. A car comes equipped with side air bags.
B. A business conducts meetings over the Internet.
O C. A surgeon performs a heart transplant.
D. A singer wins an award for a song she wrote.
the answer is definitely A.
A round ball is kicked into the air at an angle of 39 degrees above the horizontal. The
initial velocity of the ball is 32 m/s.
A. How long is the ball in the air?
B. What is the horizontal distance traveled by the ball?
C. What is the maximum height reached by the ball?
Answer:
b
Explanation:
1. If Hailey's comet has an orbital period of 75 years, how far will Hailey's Comet
go?
This question involves the concepts of the time period, orbital radius, and gravitational constant.
The distance of Hailey's comet above the Earth's Surface is "3.19 x 10⁴ km".
The theoretical time period of the comet around the earth can be found using the following formula:
[tex]\frac{T^2}{R^3}=\frac{4\pi^2}{GM}[/tex]
where,
T = Time Period of Satellite = 75 years[tex](\frac{365\ days}{1\ year})(\frac{24\ h}{1\ day})(\frac{3600\ s}{1\ h})[/tex] = 2.36 x 10⁹ s
R = Orbital Radius = ?
G = Gravitational Constant = 6.67 x 10⁻¹¹ N.m²/kg²
M = Mass of Earth = 5.97 x 10²⁴ kg
Therefore,
[tex]\frac{(2.36\ x\ 10^9\ s)^2}{R^3}= \frac{4\pi^2}{(6.67\ x\ 10{-11}\ N.m^2/kg^2)(5.97\ x\ 10^{24}\ kg)}\\\\R=\sqrt[3]{\frac{(6.67\ x\ 10{-11}\ N.m^2/kg^2)(5.97\ x\ 10^{24}\ kg)(2.36\ x\ 10^9\ s)^2}{4\pi^2}}[/tex]
R = 3.83 x 10⁷ m = 3.83 x 10⁴ km
Now, this orbital radius is the sum of the radius of the earth (r) and the distance of comet above earth's (h) surface:
R = r + h
3.83 x 10⁴ km = 0.64 x 10⁴ km + h
h = 3.83 x 10⁴ km - 0.64 x 10⁴ km
h = 3.19 x 10⁴ km = 31900 km
Learn more about the orbital time period here:
brainly.com/question/14494804?referrer=searchResults
The attached picture shows the derivation of the formula for orbital speed.
a mug rests on a inclined surface, as show in figure.
m=0,27kg θ=14∘
what is the normal force exerted on the mug?
what is the minimum coefficient of static friction required to keep the mug from sliding?
[tex]\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the Concept of the Force and power.
Let's draw a free body diagram and solve it.
we get as,
====> Normal Force = 2.566 N
and
===> Frictional Force = 0.635 N
The net force depends on the magnitudes of the frictional force and the applied force.
What is an inclined surface?The question is incomplete but I will try to help you the much I can. An inclined surface has to do with the use of an inclined plane. The static friction acts in opposition to the force that seeks to move the object up or down the plane.
The image of the question is missing hence numerical values can not be calculated. However, the net force depends on the magnitudes of the frictional force and the applied force.
Learn more about inclined surface: https://brainly.com/question/9904853?
A violin string E vibrates faster then another violin string G when bowed. Which string produced a sound with higher frequency?
Violin string E
!!!!!!!!!!!!!!
. A 1.00 kg rock is thrown up into the air from ground level at a speed of 8.00 m/s. The ball travels up
to a maximum height, then returns to the ground. Calculate the rock's momentum as it strikes the
ground.
Answer:
p = -8 kg-m/s
Explanation:
Given that,
Initial speed of the rock, u = 8 m/s
Mass of the rock, m = 1 kg
The ball travels up to a maximum height, then returns to the ground.
We need to find the rock's momentum as it strikes the ground. Let v be the final speed of the rock. Its final speed is as same as initial speed i.e. 8 m/s but in negative direction. So
p = mv
p = 1 kg × (-8 m/s)
= -8 kg-m/s
So, the rock's momentum as it strikes the ground is (-8 kg-m/s).
i. )Which unit can be used to express force?
a. Nm
b. kg/s 2
c. kg • m/s 2
d. m/s
ii. )Newton’s second law of motion relates an object’s acceleration to
a. its mass.
b. its velocity.
c. the net force acting on it.
d. two of the above.
iii. )An object is accelerating when it
a. speeds up
b. slows down.
c. changes direction
d. any of the above.
iv. )Doubling the net force acting on an objecta. doubles the acceleration
b. decreases it acceleration.
c. cuts its acceleration in half.
d. does not affect its acceleration.
v. ) If you push a 20 - kilogram mass with a force of 40 N, what will be the object’s
acceleration?
a. 40 m/s2
b. 20 m/s2
c. 10 m/s2
d. 2 m/s2
The correct choices, sequentially and respectively, are c., d., d., a., d.
Please help!! I'll thank everyone and give brainliest to the best/correct answer!!!
Using your knowledge of fluid pressure, explain why your ears hurt more and more as you dive deeper and deeper underwater.
Answer:
Ear pain is the most common complaint from scuba divers. Some divers call it "ear squeeze." As a diver goes deeper under water and the outer environment pressure increases, the pressure in the middle ear (the part behind the ear drum) is "squeezed" by the increasing pressure of the water from outside
When a runner hits the ball and makes it around all bases safely to Home Base without getting tagged out it is called a?
Answer:
Home run
Explanation:
i play
chris and molly wins $2400 in a competition they share the money in the ratio2:3 how much money do they each receive ?
Answer:
chris gets 960 and molly gets 1440
Explanation:
add the ratio up and divide
2+3=5
2400/5=480
480x2=960
480x3=1440
960+1440= 2400
If 10 waves pass a point each second and their wavelength is 30m, what is their speed?
Give formula please
Answer:
300m/s
Explanation:
velocity = frequency(wavelength)
Since 10 waves pass a point each second, frequency is 10
therefore, speed = (10)(30 = 300m/s
The speed of light can be determined using the frequency and wavelength of that wave. The speed of the wave with the wavelength of 30 m and frequency of 10 s⁻¹ is 300 m/s.
What is wavelength?The wavelength of a wave is the distance that can travel per unit time or it is the distance between two consecutive crests or troughs of the wave.
The wavelength in inversely proportional to the frequency of the wave. Frequency of a wave is the number of waves passing per second.
The relation between wavelength and frequency to the speed of the wave is written as follows:
[tex]c = v \lambda[/tex]
Thus speed of the wave is the product of its frequency and wavelength. Given that 10 waves pass per second. Thus, frequency is 10/s. Wavelength is 30 m . The speed is calculated as follows:
Speed of the wave = 30 × 10
= 300 m/s.
Therefore, the speed of the wave with the wavelength of 30 m and frequency of 10 s⁻¹ is 300 m/s.
To find more about speed of waves, refer the link below:
https://brainly.com/question/10715783
#SPJ2
b. Local action and polarization
Explanation:
The local action of a battery is the deterioration of the battery due to currents that are flowing from and to the same electrode. ... Polarization is a defect that occurs in simple electric cells due to the accumulation of hydrogen gas around the positive electrode.
what are the factors that affect the efficiency of a simple machine?
The factors that affect efficiency are //
Conductor content – load dependent.
Magnetic steel -mainly constant.
Thermal design – mainly load dependent.
Aerodynamic design – constant.
Manufacture and quality control – constant
PLEASEE HELPPLook at the diagram of two students pulling a bag of volleyball equipment. The friction force between the bag and the floor is 4 N. What is the net force acting on the bag? What direction is the bag moving in?
Answer:
The net force is 21 N, and the bag will go to the right.
Explanation:
You can find the net force by adding both values of the boy and the girl, and then subtracting four from it. You can also figure out which direction its moving by looking at which side is exerting the most force, which would be the right side.
Hope it helps!
A 350kg motorcycle is moving at 20m/s. It then speeds up to 30m/s. How much work did the engine do to accelerate?
Answer:
momentum= mass× velocity
=350kg (30-20) m/s
=3500kgm/s
what is an ionic compound?
Answer:
Compound that consist of ions joined by electrostatic forces are called Ionic Compound....
A tennis ball is hit into the air with a racket. When is the ball’s kinetic energy the greatest? Ignore air resistance.
A.
when it leaves the racket
B.
just before it reaches the ground
C.
when it reaches its maximum height
D.
when its kinetic energy and potential energy are equal
E.
just before it starts falling downward
Answer:
E
Explanation:
A wave has a wavelength of 0.02m and period of 8.0*10^-2 seconds. calculate it's speed. (showing working)
Answer:
v = 0.25 m/s
Explanation:
Given that,
The wavelength of a wave, [tex]\lambda=0.02\ m[/tex]
Time period of the wave, [tex]T=8\times 10^{-2}\ s[/tex]
We need to find the speed of a wave. The speed of wave is given by :
[tex]v=\dfrac{\lambda}{T}\\\\v=\dfrac{0.02}{8\times 10^{-2}}\\\\v=0.25\ m/s[/tex]
So, the speed of the wave is 0.25 m/s.
Please help
What is the angle of the reflected ray in the diagram above?
The most acidic rainfall ever recorded fell in Wheeling, West Virginia. The pH of this rain was 1.5. Normal rain has a pH of approximately 5.6. Explain why acid rain is harmful to waterways, animals, and plants.
Why didn’t the liquid methane change phase before 2007?
The basic reason is that before 2007 their were not enough energy in the liquid methane molecules to break the bond between them after 2007 the energy of the molecules increases which breaks the bond and the liquid methane changes phase.
Why didn’t the liquid methane change phase before 2007?It had been summer since 2002, but the lake didn’t evaporate until 2007.
The molecular attraction between methane molecules is stronger the amount of energy absorbed by liquid methane was not enough to break the inter molecular forces until 2007.
After 2007, the sun had transferred enough energy so that the kinetic energy of the methane molecules increased enough to overcome the attraction between them.
The liquid methane evaporated and the molecules started moving away from each other.
Thus the liquid methane starts to change phase after 2007 by getting enough energy from the sun.
To know more about the phase change follow
https://brainly.com/question/25664350
A man carries a 25 kg box 5 meters across the room. How much work is being done?
Answer:
Given :-Mass = 25 kg
Height = 5 m
Acceleration due to gravity = 10 m/s
To Find :-Work done
Solution :-We know that
W = mgh
W = 25 × 5 × 10
W = 250 × 5
W = 1250 J
[tex] \\ \\ \\ [/tex]
how do we use sounds in ways other than just listening?
Answer:
talking and we can make our own sound
Explanation:
Sound could be an element for detecting people or entities, This is very useful for blind people. Sounds could also heal your chakra or make you feel like dancing.
Hope I helped. :)
- Valenteer
Day and night are caused by
ОА.
the rotation of Earth on its axis.
ОВ.
the rotation of the Sun on its axis.
OC.
the Sun completing a full orbit around the Earth.
OD
the Earth completing a full orbit around the Sun.
Answer:
A
Explanation:
How is the rotation of the earth responsible for causing day and night?
We get day and night because the Earth spins (or rotates) on an imaginary line called its axis and different parts of the planet are facing towards the Sun or away from it. It takes 24 hours for the world to turn all the way around, and we call this a day.
Fill in the blank: A _____ is dissolved by a solvent
Do longitude lines run horizontally (east-west) or vertically (north-south)?