Which of the following could be a unit of power?yf5zajw y wu 8s3+6rl*

  By approximately how many powers of tenc3v6qa; n+(fe20b*mts t 8(i rpldjbv is the height of a human larger than the heig+8(6qv2b03e masn ri c(t*fdvt jlpb ;ht of a grain of sand?

  What is the value of l7jqev*c+ afd7 q0kj3bduzo.h zz;27$\frac{6.3 \mu \mathrm{m} \times 10 \mathrm{GN}}{2.1 \mathrm{~ms}} ?$

  Which of the following is a fundamental unit in the SId*mb n i:)x:ue system?

  The volume of the Earth :pat5 vl, i9k-h20bxji7x6kdzt7 d wqis approximately $10^{12} \mathrm{~km}^3$ and the volume of a grain of sand is approximately $1 \mathrm{~mm}^3$. To the nearest order of magnitude, if the Earth was hollow, how many grains of sand could it contain?

  A farmer in Tanzania has an average life expectancy of 62 years. Which of the following is an estimate of his lifetime in seconds?

  Estimate, to the nearest order of magnitude 62i4 u0dt(v dvnixqkryib:.6, the number of heartbeats of an average adnvukii.rd4x0q( :t66di 2yvb ult human in a day.

  Which of the following contains one fundamental unit s5 px:b3 rpeh5and one derived unit?

  If A=10.0 and B=0.50, which calculation will give the answer with the most deciu jz5fdi-u iq1-br --imal placei -ibdrz -i f-uuj-5q1s?

  A car has a mass of 1000kg. A mouse has a mass of 10g. What is the order off)a t (z t3ol.n1yrmt (jjw8droq45z) magnitude of the ratio betwee )4wta l jjrm)q1z.35( t(f odntroy8zn the mass of the car to that of the mouse?

  A train travels $81.5 \pm 0.7$ meters in $7.566 \pm 0.05$ seconds. What is the absolute uncertainty in its speed?  (数值)  (Leave your answer to two significant figures, without units and without the $\pm$ symbol.)

  A water tank is the l5h(hh.unt x (7ii //clpda)zo zva3*shape of a cube with sides of $2.86 \mathrm{~m}$. Each side is measured with an uncertainty of $2.2 \%$. What is the absolute uncertainty in the volume of the tank?  (数值)  (Give your answer without a unit and to 2 significant figures)

  A pyramid has a square base of sideb. -b30lqa pch $x$ and height $h$. The volume $V$ of the pyramid is given by the expression:
$$V=\frac{x^2 h}{3}$$
If $V$ is measured to $5.0 \%$ and $h$ is measured to $5 \%$, what is the percentage uncertainty of $x ?$  (数值) % (Remember to exclude the $\%$ symbol with your answer)

  The length of a pencil is measured using part of a metre rule that is gradua76(afwkt6lu(5 0of;l qbvhkd ted in millimet56k6 h uol ftdv (q7k0a;blwf(res, as shown below.

What is the length of the pencil?

  The volume $V$ of a cone of height $h$ and radius $r$ is given by the expression:
$$V=\frac{\pi r^2 h}{3}$$
In a particular experiment, there is a $6.1 \% $ uncertainty in $V$ and a $2.6 \%$ uncertainty in $r$. What is the percentage uncertainty in $h$ ?  (数值) % (Remember to exclude the $\%$ symbol with your answer)

  The radius of a balloon is -/k j +ovtw38o w9+yqd zwx zosy)l7f8measured to be $21.1 \pm 1.5 \; cm$. What is the percentage uncertainty in the calculated volume of the balloon?  (数值) % (Remember to keep three significant figures and exclude the $\%$ symbol with your answer and treat the balloon as a sphere)

  The period $T$ of oscillation of a pendulum of length $l$ is given by:
$$T=2 \pi \sqrt{\frac{l}{g}} .$$
If the uncertainty in $g$ is $1.7 \%$ and the uncertainty in $l$ is $6.3 \%$, what is the percentage uncertainty in $T$ ?  (数值) % (only fill in numerical value without the % sign and keep two significant figures)

  The lengths of the sides of jue. -y09mvje mu.,vva room are estimated as $10.0 \mathrm{~m}, 4.0 \mathrm{~m}$ and $3.0 \mathrm{~m}$, each with an uncertainty of $\pm 3 \%$. What is the absolute uncertainty in the volume of the room?  (数值)  $m^3$ (Give your answer in $\mathrm{m}^3$ to two significant figures, without a unit.)

  The potential difference (6 hv8t 0*s f,cqfnx6gu- gb4jq$V$) across a resistor is measured with a digital voltmeter to be $0.68 \; V$ . What is the percentage uncertainty in $V^2$ ?  (数值) % (only put numerical values in the blank and keep two significant figures.)

  By averaging three measurements of the same quantity which of6zluc4* kg5j, vdh7ft the following can be rz utv lfchk475d6,*jg educed?

  A student measures a distance four v*o1gix ek3* htimes. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate ofvog*e i*hk 31x this measurement?

  A student measures two df 4w(j qvuo 4iev8q;+lengths as follows: $$a = (10 \pm 0.1) \; cm$$ $$b = (20 \pm 0.1) \; cm$$
Which of the following quantities has the largest percentage uncertainty?

  The time for two events, a and bf 9n -45)hepx rl o+9 ,o1jgm5ctrllpw, are measured to be $(5.1 \pm 0.1)s$ and $(4.9 \pm 0.1)s$ respectively. In which of the following quantities is the fractional(percent) uncertainty the smallest?

  The variation of quantity P as quantity Q varies is plotted. Theory states(;ff e;0vesxy k8tag6 that P should varyfsagy(fxk0;v t8e6;e linearly with Q.

  The length of a pencil is measured using part of a measuring tape as shown belowkpk le2, /n: a(jp,ppv :p2,jppe /,(lkpnavk.

What is the length of the pencil?

  The masses and weights of different objects are -v5 uhf-duf+ex/ mt w7s965 uwkr(blq independently measured. The graph is a plot ow kx5l-e5 w7hm ffrvud9t(u6 +bu-s q/f weight versus mass that includes error bars.

What do these experimental results suggest?

  The resistance $R$, and cross-sectional area $A$, of equal lengths of wire are measured at constant temperature and a graph of $R$ against $\frac{1}{A}$ is plotted. Which one of the following graphs would be obtained if $R$ is directly proportional to $\frac{1}{A}$ and if there is a significant systematic error in the measurement of $R ?$

  The lengths of the sides of a rectangular plp 60 vms1ye,-uq,firtate are measured, and the diagram shows the measured values with theirr -vs1y eqit,f60 m,pu uncertainties.

What is the percentage error in the area of the plate?   %. (Remember to exclude the % symbol with your answer.)

  The density of a solid sphere is measured with percentage uncertainty of gtl9 *ngb0tsrlc 7i;04%. The radius of the sphere is 4.2 ± 0.3 cm. What* t7rct9b gn;l gis0l0 is the percentage uncertainty in the mass of the sphere?  (数值) % (Please do not include the % simbol in the blank)

  Experimental data has shown tl v)2bnaqs(8gs n o;asi32vzb56 xl79lr ( xezhat:
$$
P=\frac{g h^2}{u^3}
$$
where $g$ is a constant. If the percentage uncertainties in $h$ and $u$ are $a$ and $b$ respectively, what is the percentage uncertainty in $P ?$

  An experiment used to measure the acceleration due to gravity produces thm(,b d :yzyy7 zqjhr1(e following results:qyyjrbz(,: (z m1y h7d
$\begin{array}{llllllllll}7.83 & 6.98 & 7.52 & 8.01 & 7.76 & 7.15 & 6.87 & 7.25 & 8.35 & 7.54\end{array}$
Which of the following statements is true about these data?
Are there random or systematic errors, both, or neither?
(Acceleration due to gravity, $g$, on Earth is usually taken as $9.81 \mathrm{~m} \mathrm{~s}^{-2}$ ).

  A rectangle was drawn using a ruler, such that each ,a.cb wm -sxv:-bumk) measurement has an uncertainty of mb --m.x:)b a usvcwk,$0.5 \mathrm{~cm} .$

What is the absolute uncertainty in the area of the entire rectangle (i.e. combined small and big rectangles), in $\mathrm{cm}^2$ ?    $cm^2$ (Do not write units with the answer. Give your answer to 2 significant figures.)

  For an object of mas7 o1, 7 gitwn1yvztts,s $(2.0 \pm 0.1) \mathrm{kg}$, what percentage uncertainty in the velocity will give a $7.4 \%$ uncertainty in the kinetic energy ($KE = \frac{1}{2}mv^2$) ?  (数值) % (do not include the percent sign in your final result)

  An ammeter has a non-negligible zero offset error. Which of the following stat.f 6oh nt ooo;8me,ulj*ihe90k1d/ glements is corre j/ltge okl1o;, emf.ohn906ohi*8duct?

  A student measures a length fityf l :nmvs -a7io.ijf:p 7o)(ve times. All of the measurements lie between $18.8 \mathrm{~cm}$ and $19.2 \mathrm{~cm}$. What should the student quote as the absolute uncertainty in the length? The absolute uncertainty is    $cm$ (Do not include the $\pm$ symbol nor the unit)

  A piece of string 9.5 ± 0.4 cm long is cut from a longer piece that is 12.6x6cz v3z4.lgi9/ nq qb ± 0.4 cm long. How long is the remaining piece of sxvq.b6 34icl/gn q9 zztring?

  A current of value $I$ flows through a resistor of resistance $R$ and the power dissipated is $I^2 R$. The value of $I$ has an uncertainty of $\pm 2 \%$ and the value of $R$ has an uncertainty of $\pm 5 \%$. What is the percentage uncertainty in the calculated power dissipation?  (数值) % (Give your answer correct to two significant figures without the % sign.)

  A force of 10.0 ± 0.2 N is applied to a mass of 2.0 ± 57l xjbc5 zx-p0.20 kg, causing it to accelerate. What is the perzc-5xlx 75pb jcentage uncertainty of its acceleration?  (数值) % (do not include the percent sign in your result)

  The radius of a circle of wire is measured to be 10.0 ± 26 2pz 0azke /s7m;dw3b:1jbd/asutum.0 cm.
What is the percentage error in the area of the loop?  (数值) %
What is the percentage error in the circumference of the loop?  (数值) %