physics questions

吴大方2022-10-04 11:39:542条回答

physics questions
1,can the velocity of an object reverse direction while maintaining a constant acceleration?
a)no
b)yes
2,if the earth shrunk to a samller radius while keeping the same mass,and you were still standing on its durface,would your your weight be greater than,smaller than,or the same as it is now?
3,concrete has higher weight density than water.if a concrete block is completely submerged in water,the weight of displace water is
a)equal to the weight of block
b)larger than weight of block
c)smaller than weight of block
(I need the answer and some explanation.thanks.)

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hormohtb 共回答了19个问题 | 采纳率94.7%: 1 a
2 greater (g=mr)
3 c (m=sv); 1年前

54247564 共回答了38个问题 | 采纳率: 1 b why not?
2 greater because grativity=GMm/rr and r is smaller, so grativity is greater
3 c because the volume of displace water must euqual with the concrete. but concrete's weight density is high. and M=weight density * volume. so wight of displace water is smaller.; 1年前

physics questions physics questions 1,if you hold one end of a metal nail against a piece of ice,the end in your hand soon becomes cold.this is because______ a)cold flows from the ice to your hand b)cold flows from your hand to the ice c)heat flows from your hand to the ice d)heat flows from the ice to your hand 2,which one of the following would cause your bathroom;s tile floor to feel neither hot nor cold to bare feet? a)heat the tiles to higher than body temperature b)cool the tiles to below room temperature c)heat the tiles to exactly body temperature 3,a thin piece of aluminum foil doesn't feel cold when you touch or step barefoot on it.that's because____ a)thin foil has small mass,so it quickly warms up to body temperature b)thin metals are poor heat conductors 空济寺1年前1: yados 共回答了9个问题 | 采纳率77.8%

1 c heat flows from your hand to the ice 应该是热量传递,不传冷
2 c)heat the tiles to exactly body temperature 温度相同无热量传递
3 a)thin foil has small mass,so it quickly warms up to body temperature 铝箔质量太小吸收很少热量就可升温很高

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