Acarousel is moving with uniform circular motion. the centripetal acceleration of the ride is * 1 point circular
. perpendicular to the plane of motion.
zero.
directed toward the center of motion.
where should a force be applied on a lever arm to produce the most torque? * 1 point closest to the axis of rotation farthest from the axis of rotation in the middle of the lever arm it does not matter where the force is applied a boy can raise a rock that weighs 120 n by using a lever and applying a force of 25 n.
what is the mechanical advantage of the lever? * 1 point .21 3.5 4.8 225 a pebble that is 3.81 m from the eye of a tornado has a tangential speed of 124 m/s. what is the magnitude of the pebble's centripetal acceleration? * 2 points 32 m/s² 85 m/s² 435 m/s² 4036 m/s² a dog sits 1.25 m from the center of a merry go round and revolves at a tangential speed of 2.0 m/s. if the dog's mass is 19.3 kg, what is the magnitude of the centripetal force on the dog? * 2 points 103 n 40. n 61.8 n 21.3 n a ball attached to a string is whirled in a circle. if the string breaks, what causes the ball to move in a straight line? * 1 point inertia centripetal acceleration centrifugal force centripetal force find the magnitude of the gravitational force exerted on a 66.5 kg astronaut on the surface of planet x if the planet has a radius of 4.40 x 10⁶ m and a mass of 8.43 x 10²³ kg.(use g= 6.67 x 10⁻¹¹ nm/kg²) * 2 points 193 n 246 n 38.5 n 651 n how would the speed of the earth's orbit change if the earth's distance from the sun increased by 9 times? * 1 point increase by a factor of 3 increase by a factor of 9 decrease by a factor of one third decrease by a factor of 3 what is the efficiency of a crane that requires 28,000 j of energy to lift a 200 kg object 10 meters? * 2 points 15% 34% 60% 70% what is the force required to produce a 1.4 nm torque when applied to a door at a 60.0º angle and 0.40 m from the hinge? * 2 points 2.0 n 4.0 n 5.7 n 8.2 n
Solved
Show answers
More tips
- F Family and Home What does a newborn need?...
- F Family and Home Choosing the Right Car Seat for Your Child: Tips and Recommendations...
- F Food and Cooking How to Get Reconfirmation of Registration?...
- C Computers and Internet How to Get Rid of Spam in ICQ?...
- A Art and Culture Who Said The Less We Love a Woman, the More She Likes Us ?...
- F Family and Home How to Get Rid of Your Neighbors?...
- S Society and Politics How Could Nobody Know About the Dead Mountaineers?...
- H Health and Medicine How to Cure Adenoids?...
- H Health and Medicine Why Wearing a Back Brace Can Be Beneficial During Back Strain?...
- S Sport When and Where Will the 2014 World Cup be Held?...
Answers on questions: Physics
- P Physics When you accelerate in a car and are pushed back into your seat, you are experiencing , which is registered by your . A. linear motion; semicircular canals B. angular...
- P Physics Two observation points are located at distances r₁ and r₂ from a source of sound. The sound spreads out uniformly from the source, and there are no reflecting surfaces...
- P Physics Carry out the following calculation. Express your answer in the correct number of significant figures. A solid rectangular block has a density of 2.6 g/cm3. The block...
- P Physics A student completed a lab report. Which correctly describes the difference between the Question and Hypothesis sections of her report? Question states what she is asking,...
- P Physics Aball is rolled uphill a distance of 12 meters before it slows, stops, and begins to roll back. the ball rolls downhill 20 meters before coming to rest against a tree....
- P Physics Asolar system where all orbits are circular and increase in size from the nearest to the farthest away from the sun, best describes which of the following models? a....
- P Physics A 70 kg physicsstudentis running down the hall when he bumps into a chair with mass of 30 kg (the chair is not moving). After the collision, the two objects (student...
- P Physics A bobsled makes a run down an ice track starting at 150 m vertical distance up the hill. If there is no friction, what is the velocity at the bottom of the hill...
- P Physics How is the amount of work done on an object relative to its change in energy?...
- S Spanish vivimos tiempos veloces e imprevisibles, en los que los avances de la tecnología y los retrocesos de la historia lo transforman todo de forma continua y el presente...
Ответ:
> A carousel is moving with uniform circular motion. The centripetal acceleration of the ride is:
Centripetal acceleration is always directed toward the center of motion
> Where should a force be applied on a lever arm to produce the most torque?
farthest from the axis of rotation
> A boy can raise a rock that weighs 120 N by using a lever and applying a force of 25 N.
What is the mechanical advantage of the lever?
Simply divide the weight by the force applied:
120 / 25 = 4.8
> A pebble that is 3.81 m from the eye of a tornado has a tangential speed of 124 m/s. What is the magnitude of the pebble's centripetal acceleration?
Centripetal acceleration is calculated using the formula:
a = v^2 / r
a = (124 m/s)^2 / 3.81 m
a = 4,035.70 m/s^2 ~ 4036
> A dog sits 1.25 m from the center of a merry go round and revolves at a tangential speed of 2.0 m/s. If the dog's mass is 19.3 kg, what is the magnitude of the centripetal force on the dog?
a = v^2 / r
a = (2.0 m/s)^2 / 1.25 m
a = 3.2 m/s^2
The force is:
F = m a
F = 19.3 kg * 3.2 m/s^2
F = 61.8 N
> A ball attached to a string is whirled in a circle. If the string breaks, what causes the ball to move in a straight line?
The force which is directed away from the center of the motion: centrifugal force
> Find the magnitude of the gravitational force exerted on a 66.5 kg astronaut on the surface of Planet X if the planet has a radius of 4.40 x 10⁶ m and a mass of 8.43 x 10²³ kg.(Use G= 6.67 x 10⁻¹¹ Nm/kg²)
We use the formula:
F = G m1 m2 / r^2
F = 6.67 x 10⁻¹¹ Nm/kg² * (66.5 kg) * (8.43 x 10²³ kg) / (4.40 x 10⁶ m)^2
F = 193 N
> How would the speed of the Earth's orbit change if the Earth's distance from the Sun increased by 9 times?
The orbital speed is related to distance from the formula:
v = sqrt (GM / r)
where r is the distance from Earth to Sun
so if r’ = 9 r
v = sqrt (GM / 9r)
v = (1/3) sqrt (GM / r)
Therefore: Decrease by a factor of 3
> What is the efficiency of a crane that requires 28,000 J of energy to lift a 200 kg object 10 meters?
The total work done is:
Work = 200 kg * 9.8 m/s^2 * 10 m
Work = 19,600 J
So efficiency is:
efficiency = 19,600 / 28,000 * 100% = 70%
> What is the force required to produce a 1.4 Nm torque when applied to a door at a 60.0º angle and 0.40 m from the hinge?
The perpendicular component of the applied force is:
F * sin(60°) = 0.866F N
Since the moment arm is 0.40 m, the torque is:
(0.866F N)*(0.4 m) = 0.3464F N-m
This torque is equal to a value of 1.4 N-m, therefore
0.3464F = 1.4
F = 4.0 N
Ответ:
Calcium is less reactive than strontium.
hope it helps