(1 Point)
Physics, 01.03.2021 19:30 dessyrob05
Athletes wear spikes to increaseRequired to answer. Single choice.

(1 Point)
Electrostatic force
Muscular force
gravitational force
Frictional force
55,
Which of these is not true about friction? i. Friction tends to stop a moving object ii. Friction tends to stop a stationary object from moving iii. Friction acts in the same direction as the direction of motion. iv. Friction always help motionRequired to answer. Single choice.

(1 Point)
(i) and (iv)
(i) and (ii)
(iii) and (iv)
(ii) and (iii)
Which of the following is used to reduce friction?Required to answer. Single choice.

(1 Point)
Spikes in the athletic shoes
Set of grooved tyres
grinding stone
Ball bearing
77,
Sliding frictionRequired to answer. Single choice.
(1 Point)
is always greater than static friction
is always greater than rolling friction
is always smaller than rolling friction
may be smaller or greater than rolling friction depending on the surface
88,
In which case is friction a disadvantage?Required to answer. Single choice.
(1 Point)
Running a machine
writing
walking
Applying brakes
99,
The resistance offered by fluidsRequired to answer. Single choice.
(1 Point)
drug
drag
opposite motion
sliding friction
1010,
Which of the following is a contact force? (i) Gravitational force (ii) Electrostatic force (iii) frictional force ( iv) muscular forceRequired to answer. Single choice.
(1 Point)
(iii) and (iv)
( ii) and (iii)
(i) and (iv)
(i) and (ii)
plss tell all the answers its actually options so u can just tell like its the first one for this question in anyways plsss hel
Answers: 3
Physics, 22.06.2019 01:30
Answer as quick as ! kate is working on a project in her tech education class. she plans to assemble a fan motor. which form of energy does the motor convert most of its electric energy into? a. light energyb. motion energyc. sound energyd. thermal energy
Answers: 3
Physics, 22.06.2019 12:10
Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?
Answers: 2
Physics, 22.06.2019 14:10
Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?
Answers: 1
Physics, 23.06.2019 00:40
Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. the researchers grew one type of bacteria in twenty-four identical covered petri dishes. then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. they left the remaining six petri dishes closed as a control group. when the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. the researchers concluded that not using any hand sanitizer would lead to the least bacterial growth. which statement best explains why the researchers’ conclusion was not justified? the experiment tested too many variables. the control group was not treated the same as the experimental group. the sample size of twenty-four petri dishes is not large enough. the single type of bacteria is not adequate to make any conclusions.
Answers: 1
Athletes wear spikes to increaseRequired to answer. Single choice.

(1 Point)
(1 Point)
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