Eleventh grade, junior year, or grade 11 (called Year 12 in Wales and England) is the eleventh, and for some countries final, grade of secondary schools. Students are typically 16–17 years of age, depending on the country and the students' birthdays.
for c) i need help
d)
Given: Let [forward] be positive.
F 1 = — 250 N
F 2 = 360 N
Unknown: a = ?
Equation: F net= F1+ F2
F net= m a
Solve: F net= (— 250 N) + 360 N = 110 N
F net= m a
a = F net/ m
= 110 N / 220 kg= 0.5 m/s [forward]
Statement: The acceleration of the boat is 0.5 m/s [forward].
Can anyone explain how to solve this question, please? The answer is a=5 & b=7, but I don't understand how to solve it.
The graph of function f(x) = ax + b is transformed by the following sequence:
translation by (1) (meaning 1 horizontal, 2 vertical)
(2)...
Homework Statement
A ferry boat is crossing a river that is 8.5 x 10^2 m wide.
The average velocity of the water relative to the shore is 3.8 m/s E and the average velocity of the boat relative to the water is 4.9 m/s S.
How long does it take for the boat to get across?
Homework EquationsThe...
1. Determine the equation that represents the relationship between the power and the current when the electric potential difference is 24v and the resistance is 1.5 Ω. 2. Draw a graph of the parabola that corresponds to the equation found in (a). 3. Determine the current needed in order for...
Homework Statement
A water balloon is fired 34 m/s from a water cannon, which is aimed at an angle of 18° above the ground. The centre of the cannon's target (which has a radius of 1.0m) is painted on the asphalt 42m away from the water cannon.
a) Will the balloon hit the target? Justify your...
Homework Statement
What is the Average Force between m1 and m2. Show all work.
Note that the masses are both at rest, and begin to push off of each other in opposite directions.
Their velocity is measured when they reach 20cms distance. (I calculated the velocity when they reached this point...
I have solved the question below and was wondering someone can have a look at it and give some feedback, please.
Homework Statement
An object is pushed from rest across a sheet of ice, accelerating at 5.0 m/s2 over a distance of 80.0 cm. The object then slides with a constant speed for 4.0 s...
Let's say that 2 objects inelastically collided in outer space.
One has a Mass of 2kg, and velocity 5m/s.
The other has a Mass of 4kg, and velocity is 0m/s. ( at rest)
1) Energy cannot be created or destroyed. (Energy is conserved)
2) Momentum is conserved.
Total Momentum before was (2x5) +...
Homework Statement
A 125 - G arrow is shot vertically upwards with a Vi of 28/ms. Assuming a 20% loss in Mechanical Energy while ascending, what maximum height above the position it was shot does it reach?
Homework Equations
Vi= 28m/s
Vf= O m/s
D= ?
a= -9.8 m/s
Vf^2= Vi^2 + 2aD
Eg = mgh
Ek =...
Homework Statement
A person performs 6.1 J of work to lift an object without acceleration to a particular height on Earth. Write an equation describing that energy change and analyze it to determine how different the energy would be required to lift the same object to the same height on the...
Homework Statement
A child pulls a trolley by the handle along a ﬂat sidewalk. She exerts a force of 80.0 N at an angle of 30.0° above the horizontal while she moves the wagon 12 m forward. The force of friction on the trolley is 34 N.
Homework Equations
(a) Calculate the mechanical work done...
http://s880.photobucket.com/user/nipplebum/media/ATT00001%2010.jpg.html?sort=3&o=0 1. Homework Statement
find the unknown poles, draw the magnetic field around the conductor, and determine the direction of the force acting on the conductor.
Homework Equations
N/a
The Attempt at a Solution...
Homework Statement
You add 50 g of steam at 150 degrees centigrade to 50 g of ice at negative five degrees centigrade. What is the final temperature?
Homework Equations
Q = mLfv
Q = mcΔT
The Attempt at a Solution
Qg = Ql
Q1 + Q2 = -Q3 - Q4
mLf + mcΔT = -mLv + mcΔT [ΔT will be negative, making...
Driving along a steady speed of 26m/s and suddenly see a child 150m from you. Breaks can produce acceleration of -2.5m/s^2 but it takes time to get the foot from the gas to the brake pedal. How much time do you have, if to avoid hitting the child?
Homework Statement
Two pipes, Identical in length and closed at one end are producing notes. You are very, very annoyed because the notes are creating an audible beat frequency of 20Hz. If one pipe is producing a note at 10Hz and the temperature is 15C (which correlates to a speed of sound of...
1. Question.
A 15 kg child slides from rest, down a playground slide that is 4.0m long. The slide makes a 40degree angle with the horizontal. The child's speed at the bottom is 3.2 m/s. What was the force that the slide was exerting on the child?
Answer: 75 N [up the slide]
2. My Attempt.
Ek...
Hey guys, wasn't too sure where I should post this but here goes:
Im currently taking a grade 11 introductory physics course in Ontario, Canada. We are currently learning the basics of nuclear physics. For most units, I'm able to foresee the thinking (hard) questions our teachers usually point...
Homework Statement
A team of six poodles are pulling a 14.0 kg sled at 8.0 m/s
IF the dogs are applying a 66N force, find the coefficient of kinetic friction
Homework Equations
Ff=u*Fn
Fnet=ma
Fnet=(-Ff)+FaThe Attempt at a Solution
I honestly have no clue where to start for this question.
Homework Statement
I have to draw a free body diagram representing the motion of an object @ a given point in time. This diagram is for section 1.
It's of a 1.25 kg cart with a 0.6 kg can attached to it with a pulley-system. When the can drops, the cart begins to move. In section one, when the...
Homework Statement
A 2 kg sponge is dropped from rest, pulled down by gravity. how fast will it be traveling in 6 seconds, with a 5 N force of air resistance acting on it ?
Homework Equations
vf= vi+ gt (im just guessing coz I am not sure )
The Attempt at a Solution
the speed in 6 seconds...
Homework Statement
If there is a reaction, write out the chemical equation for
Hg(NO3)2(aq) + CH3COONa(aq)
Homework Equations
N/A
The Attempt at a Solution
The answer says that there is no reaction. I have absolutely no idea why not.
Homework Statement
40 kg crate is pushed at a constant velocity along an incline with a vertical height of 4 m and inclined distance of 7 m. How much work was done on the crate in moving it to the top of the ramp?
For the incline, think of a right angle triangle with the 7 m being the...
Homework Statement
A 4.7x10^3 kg asteroid is acted on by a gravitational force of 2.0x10^2 N from another asteroid that is 3.0x10^2 km (3.0x10^5 m) away. What is the mass of the second asteroid?
Homework Equations
The equations we have been working with are
in which G is 6.67*10-11Nm^2/Kg^2...
[b]1. while driving a lady sees a cat run on the road and it takes her 0.80s to react and put her foot on the brake. her car is traveling 25 m/s. (a)how far will the car travel before she puts her foot on the brake and (b) if when the brake is applied the car decelerates at a uniform rate of 9.3...
Grade 11 courses to become a pediatrician
Hi, I would like to pursue a career in the medical area and would like to become a pediatrician.
I just submitted my courses for grade 11...and I would like to go to mcmaster university.
Here are my courses:
1. Functions (math)
2. Chemistry
3...
Homework Statement
An object experiences a friction force, Ff, of 6.6 N and a normal force, Fn, of 30.0 N.
a) What is the coefficient of friction, μ?
b) Is the object moving? How do you know?
Homework Equations
μ = Ff / Fn
The Attempt at a Solution
I understand how to get...
Grade 11 Physics Final Project. Help! (Kinematics)
first of all, I am new to the forum. and i was wondering if i should post this on homework forum or general physics. then i decided to post it here.
so i have been working on a final project for my grade 11 physics.
the teacher wants us...
Homework Statement
Sandra needs to deliver 20 cases of celery to the farmer's market directly east across the river, which is 32 km wide. Her boat can move 2.5 km/h in still water. The river has a current of 1.2 km/h flowing downstream, which happens to be moving in a southerly direction...
Homework Statement
If Phrank's new speakers produce a sound of 90dB at 10m,
a) How many decibels would be required for the sound to be one hundred times the intensity?
b) How close would Phrank need to stand for the intensity to be at 60dB?
Homework Equations
β2 - β1 = 10 log...
Homework Statement
A cannonball is launched at 90.0m/s at an angle of 60.0° above the horizontal from the top of a tower that is 38.0m high. How far away from the tower does it land if the ground is level?Homework Equations
Vix=90.0m/s X Cos60
Viy=90.0m/x X Sin60The Attempt at a Solution
I used...
Homework Statement
Answer included:
Homework Equations
Ff = μFn, where mu can be kinetic or static.
Fnet = ma
Fg = mg
I think that's it.
The Attempt at a Solution
I got the first part, I need help with acceleration. There's no evidence that I tried the second part I guess, as...
Homework Statement
Accelerating uniformly at a rate of 0.20m/s^2 from initial velocity of 3.0m/s, how long will it take to travel a distance of 12m
Homework Equations
The Attempt at a Solution
Answer is 3.5 seconds
But I don't know how you get that
Also another question...
Hi,
I just started gr 11 physics, and I need help.
I don't really understand the concepts being given and I want to learn more, so if you have any good websites or books that will help me, please list them
Thank you!
The Question:
A water balloon is fired 34 m/s from a water cannon, which is aimed at an angle of 18° above the ground. The centre of the cannon's target (which has a radius of 1.0m) is painted on the asphalt 42m away from the water cannon.
a) Will the balloon hit the target? Justify your...
A delivery truck drives 14.0 km [E], 6.0 km [N], 12.0 km [ N 15° E], and then 2.0 km [N 65° E]. This takes him 42 minutes. Calculate the truck's distance and displacement.
When you draw this diagram you basically get two triangles. One large triangle and one smaller triangle. You need to...
Hi guys, This might seem like a rather ambiguous question but I have a physics project on motion that I need to do. It is rather a big project accounting for a weighting of around 15-17% of my total year mark.
Now here's the thing I need to find something to investigate/experiment with...
Homework Statement
How far will a football travel when it is thrown at 62 km/h at an angle of 35° to the ground?
Homework Equations
V1v = v1 sinθ; Δd= V1v * Δt + 1/2 * (-9.8 m/s^2) * Δt^2;
The Attempt at a Solution
V1v = v1 sinθ
V1v = 17.2 m/s sin35° [up]
=9.9 m/s [up]
Δd= = V1v...
Homework Statement
Hey guys...
The palomino horse results from the combination of two incompletely dominant genes, one codes for the colour chestnut and the other for cream. Determine the expected genotypic and phenotypic ratios for the following crosses:
a.)chestnut and cream
b.)palomino...
Homework Statement
a 0.20kg lead shot is heated to 90 degrees celsius and dropped into an ideal calorimeter containing 0.50kg of water initially at 20 degrees celsius. What is the final equilibrium temperature of the lead shot? The specific heat capacity of lead is 128 Joules/(kg degrees...
Homework Statement
What will be the equilibrium temperature when a 245-g block of copper at 285° c is placed in a 145 g aluminium calorimeter cup containing 825 g of water at 12°c?
Homework Equations
q=mcΔt
qlost+qgained=0
-qlost=qgained
-m1c1t1=m2c2t2
The Attempt at a Solution...
Physics project, Grade 11, Help :)
Hello everyone, I am new to this site so forgive me if anything I say is wrong or faulty.
In my grade 11 physics class, we have been assingned a project, one that we choose what our focus will be. I have chosen to dive into the field of robotics and the first...
Easy N2L question... grade 11 physics
Problem: A 500g dynamics cart is attached to a 50g mass, which is suspended over a pulley. When released from rest, it took 1.5 s for the cart to move a distance of 1m.
Find: a) acceleration of cart,
b) friction between cart and track...
Homework Statement
an autombile 2200kg moves with a velocity of 32m/s on a level road.
a comstant braking force of 6000N is applied to the automobile wheels bringing it to a stop eventually
a) what distance will the vehicle travel after the brake are applied?
b) calcutate the work done by...
Homework Statement
What volume of CO2 at 333 K and 90 kPa is produced when 0.4 L of 0.6 M solution of H3PO4 reacts with 36 g of Na2CO3?
Homework Equations
The Attempt at a Solution
I calculated the moles for Na2CO3 and H3PO4 but I am lost
I missed the day where we were taught the formulas for frequency & wavelength, so doing the questions below are a struggle. Please someone explain how .
Question 1 (wavelength) : The speed of sound in air at room temperature is 343m/s. The sound wave produced by striking middle C on a...
Hey there guys and girls,
My name is Mark, I'm in a bit of a predicament here I have received an assignment in my grade 11 biology class which I am currently having some trouble with. Our task is as follows: This task examines the body plans of selected animal(both structure and function)...