Chiếu 1 tia sáng SI cho tia phản xạ IR. Khi quay gương quanh trục bất kì trùng với mặt gương ta thấy tia phản xạ IR quay đi 1 góc 10 độ. Gương đã quay 1 góc bao nhiêu độ ?

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?

Which of the following is the best name for mgcl2

What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ? a. 10% b. 20% c. 80% d. 25%