b.yes, the obtained speed is almost equal to the world-record.
c.no, the obtained speed is greater than the world-record.
d.no, the obtained speed is almost equal to the world-record.
The answer is
A. Yes, the obtained speed is less than the world record
The explanation:
when the obtained speed is 6 m /s
and the world record speed = distance / time = 100 m / 10 s = 10 m/s
So, Yes, the obtained speed is less than the world record
Not only is it less, its also a reasonable average speed for a somewhat athletic person. Therefore, the leap is entirely possible.
-Samuel Brady gained his lasting notoriety for his leap over the Cuyahoga River around 1780 in what is now Kent, Ohio. After following a band of Indians into the Ohio country, a failed ambush attempt resulted in the band chasing Brady near the Cuyahoga River. To avoid capture, Brady leaped across a 22-foot (6.7 m) wide gorge of the river (which was widened considerably in the 1830s for construction of the Pennsylvania and Ohio Canal) and fled to a nearby lake where he hid in the water under a fallen tree using a reed for air.
Part (a): The minimum speed of Brady should be to cross the cliff.
Part (b): The speed of Brady’s leap is possible to achieve, as it is less than the speed of world record.
Further Explanation:
(a)
Brady jumps from a cliff to go on other side. He crosses horizontal distance from a height of . To jump from cliff, he follows the Newton’s law of motion.
Given:
The horizontal distance is .
The vertical distance is .
Concept:
The horizontal distance in meter is .
The vertical distance in meter is .
To obtain the time of flight, applying one of the equation of motion given as:
Substitute for and rearrange the above equation for :
Substitute for and for in above equation.
The time of flight and time taken to cover horizontal distance are equal.
Horizontal velocity of Brady given as:
Thus, the minimum speed of Brady should be to cross the cliff.
(b)
The minimum speed with which Brady is running is .
The speed of world record given as:
Thus, the speed of Brady’s leap is possible to achieve, as it is less than the speed of world record.
Learn more:
1. Projectile motion of a body: brainly.com/question/11023695
2. Body in pure rolling motion: brainly.com/question/9575487
3. Newton’s law of motion: brainly.com/question/6125929
Answer Details:
Grade: High School
Subject: Physics
Chapter: Kinematics
Keywords:
1780, Brady's Leap, Captain, Sam, U.S. Continental Army, horizontally, cliff, Ohio's Cuyahoga, gorge, leap, 22 ft, 20 ft, minimum, speed, river, 100 m, dash, 10 s, jump, time of flight, vertical and distance.
substitution with units.]
The resistivity of the plantinum wire is 1.06 × 10⁻⁷Ωm
From the question,
We are to determine the resistivity of the wire
Resistivity can be calculated from the formula
Where is the resistivity of the wire
R is the resistance
A is the cross-sectional area
and is the length of the wire
From the given information,
R = 0.757 ohm (Ω)
A = 3.50 × 10⁻⁶ m²
= 25.0 m
Putting the parameters into the formula, we get
Hence, the resistivity of the plantinum wire is 1.06 × 10⁻⁷Ωm
Learn more on Calculating Resistivity here: brainly.com/question/5595373
Answer: Forces and Motion Unit Test (Connexus)
1. A. 3 km north
2.B. The airplane
3. C. at a particular instant
4. D. all of the above
5. C. the front seat of the car
6. C. inertia
7. C. one-third its weight on Earth's surface
8.D. gravity
9.D. all of the above
10. C. Pascal's principle
11.D. The weight of the balloon is less than the weight of the air displaced by the balloon
12.C. fluid displaced by the object
13. displacement
14.vector addition
15. positive
16 projectile
17. force,mass
18. increases
19.equally
These are the answers I put for the typed out Essay's
20. Speed is the distance traveled by an object where as, velocity is distance traveled by an object per unit time in a particular direction. Speed is a scaler quantity where as velocity is a vector quantity.
21. Acceleration is the rate of change, which means the change in velocity (vf-vi) with time(t) Where vf if the final velocity and vi is the initial velocity
22. Acceleration can be described as changes in speed, direction or both. The ball is moving at a constant speed, but its direction is changing continuously Because it's direction is changing, the ball is experiencing continuous acceleration.
23. For graph A, I can say that velocity is constant until it reaches time of 8 seconds and a constant velocity is again exhibited starting at time 12 seconds
24. For Graph B, the velocity is changing as time pass by since the slope is changing, At time of 2 seconds, graph A has greater velocity since it has a steeper slope.
25. 300 meters
26. Graph A shows greater velocity because Graph A has a steeper slope than Graph B.
27. 38 kg * 2.2 m/s=83.6 kg-m/s
28. The pressure inside the tube is greater than the pressure outside the tube because primarily of the smaller area of the tube. This increases up the pressure and let the fluid rise up.
29. The fertilizer is pushed up the tube.
Explanation: I hope this helps :)
The expression for thermal energy and power we were able to find the time necessary to heat the fuel is t = 689 h
To find
The international measurement system (SI) establishes the fundamental units in the measurement processes, this is defined by convention, giving uniformity in the calculation process and measurement exchange. Before starting the exercise we must reduce the magnitude to the SI system
PM = 32 g / mol ( g) = 32 10-3 kg / mol
T₀ = 5/9 (ºF -32) + 273.15 = 5/9 (186 32) +273.15 = 152.0 K
T_f = 5 * (78 - 32) +273.15 = 298.7 K
c_e = 0.099 kj / mol k () = 0.099 10³ J / mol K
The mole is the amount of matter of the international system (SI), the moles exist must be calculated since they are the mass of the compound for this we use a direct rule of proportions, if a mole has more than 32 10⁻³ kg, when moles are 1640 kg
n =
n = 1640/32 10⁻³
n = 51.25 10³ mol
If we assume that all energy transfer is thermal, we can use
Q =
Q = 51.25 10³ 0.099 10³ (298.7 -152.0)
Q = 7.44 10⁸ J
Power defined by the relationship between work and time
P =
In this case the thermal work is equal to the heat ( W=Q)
t =
t = 7.44 10⁸ / 300
t = 2.48 10⁶ s
They indicate that the answer is given in hours, let's reduce the time
t = 2.48 106 s (1h / 3600s)
t = 6.89 10² h
In conclusion, with the relationship of thermal energy and power, we were able to set the time necessary for the amount of fuel to be t = 689 h
Learn more about thermal energy and power here:
Answer:
The value is
Explanation:
From the question we are told that
The molar mass of hydrazine is
The initial temperature is
The final temperature is
The specific heat capacity is
The power available is
The mass of the fuel is
Generally the number of moles of hydrazine present is
=>
=>
Generally the quantity of heat energy needed is mathematically represented as
=>
=>
Generally the time taken is mathematically represented as
=>
=> t = 2480505.6377 s
Converting to hours
=>