Предмет: Физика, автор: dariamostovik

Гальмо легкового автомобіля є справним,якщо за швидкості 8 м/с гальмівний шлях автомобіля дорівнює 7,2м. Визначте час гальмування та прискорення руху автомобіля.​

Ответы

Автор ответа: ilechkoihor
5

Ответ:

а≈4.44 м/с² t=1.8 c

Объяснение:

S=v0t-(at²)/2

V=V0-at; V=0

V0=at; a=V0/t

S=V0t-(V0t)/2=(2*V0t-V0t)/2=V0t/2

S=V0t/2; t=2S/V0=2*7.2/8=1.8 с

a=V0/t=8/1.8≈4.44 м/с²

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Llandudno is truly a fine and handsome place, built on a generously proportioned bay and lined along its broad front with a huddle of prim but gracious nineteenth-century hotels that reminded me in the fading light of a lineup of Victorian nannies. Llandudno was purpose-built as a resort in the mid-1800s, and it cultivates a nice old-fashioned air. I don’t suppose that Lewis Carroll, who famously strolled this front with little Alice Liddell in the 1860s, would notice a great deal of change today.
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All the guesthouses had boards out front listing their many amenities – COLOUR TV, HOSPITALITY TRAYS, FULL CENTRAL HEATING, and the coyly euphemistic EN SUITE ALL ROOMS, meaning private bathrooms. One place offered satellite TV and a trouser press, and another boasted CURRENT FIRE CERTIFICATE – something I had never thought to look for in a B&B. All this heightened my sense of unease and doom. How could I possibly choose intelligently among such a variety of options?
I selected a place that looked reasonable enough from the outside – its board promised a color TV and coffee making facilities, about all I require these days for a Saturday night – but from the moment I set foot in the door I knew it was a bad choice. I was about to turn and flee when the owner emerged from a back room and stopped my retreat with an unenthusiastic “Yes?” A short conversation revealed that a single room with breakfast was for £19.50. It was entirely out of the question that I would stay the night in such a dismal place at such an exorbitant price, so I said, “That sounds fine,” and signed in. Well, it’s so hard to say no.
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The bathroom, faintly illuminated by a distant light activated by a length of string, had curling floor tiles and years of accumulated dirt packed into every corner. I peered at the yellowy tile around the bath and sink and realized what the landlord did with his phlegm. A bath was out of the question, so I threw some cold water on my face, dried it with a towel that had the texture of shredded wheat, and gladly took my leave.
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1) all hotels had a private bathroom.
2) there were fewer options on offer.
3) there were fewer guest houses.
4) they were all of B&B type.
А19 Why did the narrator agree to the room?
1) He felt sorry for the landlord.
2) He could not refuse the offer.
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А20 Why was the bath out of the question?
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2) There was no hot water.
3) The bathtub was dirty.
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2) Indifferent.
3) Positive.
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