Answer: true
Explanation:
Answer:
the answer is true answer true
1. How far away will a ball land when thrown from a hill 70 m high at a 45 angle from the horizontal at an initial velocity of 9 m/s?
2. How long will it take for the ball in problem 1 to fall to the ground? Remember the pull of gravity is (-9.8 m/s)
3. What is the maximum height reached by the object?
Answer:
[tex]28.53\ \text{m}[/tex]
[tex]4.48\ \text{s}[/tex]
[tex]72.1\ \text{m}[/tex]
Explanation:
[tex]y_0[/tex] = Height from where the ball is thrown = [tex]70\ \text{m}[/tex]
[tex]\theta[/tex] = Angle of inclination = [tex]45^{\circ}[/tex]
[tex]u[/tex] = Initial velocity = [tex]9\ \text{m/s}[/tex]
[tex]g[/tex] = Acceleration due to gravity = [tex]9.8\ \text{m/s}^2[/tex]
Range of projectile is given by
[tex]R=\dfrac{u\cos \theta }{g}\left(u\sin \theta +{\sqrt{u^{2}\sin ^{2}\theta +2gy_{0}}}\right)\\\Rightarrow R=\dfrac{9\cos45^{\circ}}{9.8}\left(9\sin45^{\circ}+\sqrt{9^2\left(\sin45^{\circ}\right)^2+2\times 9.8\times 70}\right)\\\Rightarrow R=28.53\ \text{m}[/tex]
The ball will land [tex]28.53\ \text{m}[/tex] away.
Time of flight is given by
[tex]t=\dfrac{u\sin \theta +{\sqrt{(u\sin \theta )^{2}+2gy_{0}}}}{g}\\\Rightarrow t=\dfrac{9\sin 45^{\circ} +{\sqrt{(9\sin 45^{\circ} )^{2}+2\times 9.8\times 70}}}{9.8}\\\Rightarrow t=4.48\ \text{s}[/tex]
The time the ball will stay in the air is [tex]4.48\ \text{s}[/tex]
Maximum height is given by
[tex]h=y_0+\dfrac{u^2\sin^2\theta}{2g}\\\Rightarrow h=70+\dfrac{9^2\times \sin^245^{\circ}}{2\times 9.8}\\\Rightarrow h=72.1\ \text{m}[/tex]
Maximum height the object will reach above the ground is [tex]72.1\ \text{m}[/tex].
who makes the first atomic bomb?
Answer:
Robert Oppenheimer made the first atomic bomb.
In which type of dictatorship is power help by single leader who demand become law for the entire country
Answer:
Autocracy
Explanation:
Which chemical cannot be further broken down into other chemicals using ordinnary laboratory processes
Answer:
iron i think
Explanation:
Which of these actions would increase heat transfer between two objects?
establishing their thermal equilibrium
increasing the area of their contact
using objects with similar specific heats
reducing the time of their contact
Answer:
It's b
It said I needed at least 20 characters so I'm writing this sorry guys
Answer:
b increasing the area of their contact
Explanation:
a student weighing 490 N stands on a spring scale on earth. what is the students mass(gravity is 9.8 m/s
Answer:
Mass, m of the student is 50kg.
Explanation:
Given the following data;
Weight of student = 490N
Acceleration due to gravity = 9.8m/s
Weight is the product of the mass of an object or body multiplied by gravity.
Mathematically, weight is;
[tex] W = mg[/tex]
Where;
W represents the weight of a body measured in Newton.
m represents the mass of a body measured in kilograms.
a represents acceleration due to gravity measured in metre per seconds.
[tex] m = \frac{W}{g}[/tex]
[tex] m = \frac{490}{9.8}[/tex]
Mass, m = 50kg.
Therefore, the mass of the student is 50kg.
A boy starts jogging with a speed of 4.0 m/s and
reaches a speed of 5.0 m/s after covering a distance
of 9 m. What is the boy's acceleration?
Answer:
acceleration=0.111 m/s²
Explanation:
acceleration = change in velocity/time taken
1/9=0.1111
acceleration=0.111 m/s²
SOUND IS A FORM OF WAVE.LIST AT LEAST 3 REASONS TO SUPPORT IDEA THAT SOUND IS A WAVE.
Which statement best explains acceleration?
A.
It is the total distance covered over a period of time.
B.
It is a change in velocity over a period of time.
C.
It is a change in displacement over a period of time.
D.
It is a change in direction over a period of time.
Answer:
B
Explanation:
Answer:
It is a change in velocity over a period of time.
Explanation:
A kayaker needs to paddle north across a 100-m-wide harbor. The tide is going out, creating a tidal current that flows to the east at 2.0 m/s. The kayaker can paddle with a speed of 3.0 m/s. In which direction should he paddle in order to travel straight across the harbor? Express your answer in degrees measured north of east.
Answer:
[tex]41.81^{\circ}[/tex]
Explanation:
The tidal current flows to the east at 2.0 m/s and the speed of the kayaker is 3.0 m/s.
Let Vector [tex]\overrightarrow{OA}[/tex] is the tidal current velocity as shown in the diagram.
In order to travel straight across the harbor, the vector addition of both the velocities (i.e the resultant velocity, [tex]\vec {R}[/tex] must be in the north direction.
Let [tex]\overrightarrow{AB}[/tex] is the speed of the kayaker having angle \theta measured north of east as shown in the figure.
For the resultant velocity in the north direction, the tail of the vector [tex]\overrightarrow {OA}[/tex] and head of the vector [tex]\overrightarrow{AB}[/tex] must lie on the north-south line.
Now, for this condition, from the triangle OAB
[tex]|\overrightarrow{AB}|\sin \theta=|\overrightarrow{OA}|[/tex]
[tex]\Rightarrow \sin\theta=\frac{|\overrightarrow{OA}|}{|\overrightarrow{AB}|}=\frac 2 3[/tex]
[tex]\Rightarrow \theta=\sin^{-1}\frac23[/tex]
[tex]\Rightarrow \theta=41.81^{\circ}[/tex]
Hence, the kayaker must paddle in the direction of [tex]41.81^{\circ}[/tex] in the north of east direction.
Kindly Help me with the questions :)
Answer:
Just use a cm ruler. There should be one on your computer screen.
P.E QUESTION
Please match the vocabulary words.
1. isokinetic exercise
2. Olympic-style weight lifting
3.1RM
4. plyometrics
5.isotonics exercise
sport, not an exercise program
muscle fitness exercise that involves movement
the maximum weight that a person can lift once
exercise that builds power
exercise that requires a special machine
what is the weight of a rock with a mass of 3.6 kilograms
The weight of a rock with a mass of 3.6 kilograms will be 35.3 N. The weight of matter is found as the product of the mass and the gravitational acceleration.
What is mass?Mass is a numerical measure of inertia, which is a basic feature of all matter. It is, in effect, a body of matter's resistance to a change in speed or position caused by the application of a force.
In the International System of Units (SI), the kilogram is the unit of mass.
The given data in the problem is;
The weight of a rock is,[tex]\rm W[/tex]
The mass of rock is,[tex]\rm m= 3.6 \ kilograms[/tex]
The weight of matter is found as the product of the mass and the gravitational acceleration;
[tex]\rm W= mg \\\\ \rm W= 3.6 \times 9.81 \\\\ W=35.3 \ N[/tex]
Hence, the weight of a rock will be 35.3 N.
To learn more about the mass, refer to the link;
https://brainly.com/question/13073862
#SPJ2
kyle has a mass of 54kg and is moving at 3 m/s what is his kinetic energy
Answer:
243J
Explanation:
K.E = 1/2 x 54 x 3^2
K.E = 1/2 x 54 x 9
K.E = 1/2 x 486
K.E = 486/2
K.E = 243J
A car accelerates from 6.0 m/s to 18 m/s at a rate of 3.0 m/s^2. How far does it travel while accelerating?
A. 82m
B. 29m
C. 48m
D. 144m
Answer:
48
Explanation:
we know that
v^2=u^2+2as
18^2=6^2+2*3s
324=36+6s
6s=324-36
6s=288
s=48
plz markbas brainalist
An engine exert a force of 1500 N. If the car has a mass of 500 kh what is the acceleration of the car?
Answer:
3 m/s/s
Explanation:
Use Netwon's law of motion F=ma; F=Force; m=mass; a=acceleration
solve for a by dividing both sides by the mass
a=F/m
1500 N/500 kg :(N=kg-m/s/s)
3 m/s/s
The tallest roller coaster in the world used to be the Desperado in Nevada. It has a lift height of 64 m. If an archer shoots an arrow straight up in the air and the arrow passes the top of the roller coaster 3.0 s after the arrow is shot, what is the initial speed of the arrow?
Answer:
36 m/s
Explanation:
Time (t) = 3s
Displacement (s) = 64m
Acceleration (g) = -9.8m/s^2
Initial speed (u) = ?
Use the following equation:
s = ut + 1/2 at^2
64 = u*3 + 0.5 * -9.8 * 3^2
64 = 3u - 44.1
u = 36.03m/s
The initial speed of the arrow is 36.03 m/s
The given parameter:
the lift height, h = 64 m
time taken to reach the top of the roller coaster, t = 3.0 s
To find:
the initial speed of the arrowThe initial speed of the arrow is calculated by using the following kinematic equation:
[tex]h = ut - \frac{1}{2} gt^2\\\\where;\\\\u \ is \ the \ initial\ speed\\\\64 = 3t- (0.5\times 9.8 \times 3^2)\\\\64 = 3t - 44.1\\\\3t = 64 + 44.1\\\\t = \frac{108.1}{3} \\\\t = 36.03 \ m/s[/tex]
Thus, the initial speed of the arrow is 36.03 m/s
Learn more here: https://brainly.com/question/14288942
A5 kg football is launched 45 degrees above the horizontal at a speed of 26 m/s.
What is the time of flight for the football from the point it left the ground until it hit the ground?
A . 2 m/s^2
B . 30 m/s^2
C . 30 m/s
D . 0.5 m/s
Answer:
C-30m/s that my answer
State the two factors on which the mass of an object depend
For objects in free-fall, what is the relationship between an object's mass and its acceleration
Answer:
the objects mass is independent of its acceleration in free fall
The acceleration of the object equals the gravitational acceleration. The mass, size, and shape of the object are not a factor in describing the motion of the object. So all objects, regardless of size or shape or weight, free fall with the same acceleration.
What is blood ? Name its components
2) What distance does the car take slowing down from 25 m/s if it has a
deceleration rate of 5 m/s for 5 seconds?
25 m will be taken to stop the car
Which action best helps students determine what they need to get out of their reading?
Answer:
C.) defining the purpose for reading
Explanation:
Just did the quiz on edge
PLEASE HELP AND HURRY
At what point will the vertical component of the balls velocity be the smallest?
A. point x
B. point y
C. point z
D. not enough information
Answer:
I believe your answer would be B. point y
how many light years away is the sun from the middle of the Millky way
Answer:
28,000 lightyears
Explanation:
The diameter of the Milky Way is about 100,000 light-years and the Sun is located about 28,000 light-years from the Galactic Center.
Two hockey pucks, each with a mass of 0.2 kg, slide across the ice and
collide. Before the collision, puck 1 is moving 16 m/s to the east and puck 2 is
moving 11 m/s to the west. After the collision, puck 1 is moving at 11 m/s to
the west. What is the velocity of puck 2?
A. 16 m/s west
B. 16 m/s east
C. 11 m/s east
D. 11 m/s west
HELPPP PLEASE I HAVE NO IDEA HOW TO DO THIS
Puck 1 after collision with Puck 2 moves towards the west with a speed of 11 m/s, so Puck 2 will move towards the east with a speed of 16 m/s. Hence, option B is correct.
What is collision?A collision, also known as an impact, occurs when two entities, such as two pool pieces, a country club, and a ball, a mallet and a nail, two rail cars when joined, or a tumbling object and a floor, suddenly and violently collide in close proximity to one another. The consequence of the impact is affected by the force, the length of time the items are in contact, the materials the two objects are made of, and other factors. According to conventional knowledge, a high-strength steel ball will rebound almost to the same spot from which it was dropped, in contrast to a mud or lead ball.
All of the kinetic energy of the colliding bodies is lost in a fully elastic impact, while the loss of kinetic energy is greatest in a perfectly plastic impact.
Therefore, the velocity of Puck 2 is 16 m/s towards the east direction.
To know more about Collision :
https://brainly.com/question/13138178
#SPJ2
How much force is needed to make a 225 kg object accelerate at a rate of 2.5 m/s²?
HEY CAN ANYONE ANSWER DIS RQ PLS!!!!
Answer:
scale and balance
Explanation:
Answer:
scale and balance
please follow me
Which of the following is an example of an
irregular bone?
a. sternum
b. tarsal
c. mandible
d. femur
Answer:
c. mandible
Explanation:
